Task: Error-Detect (source dataset: Spreadsheet-Tables)

Task: 
You are given a column of data from a table. Your job is to examine each value in the column, and identify if there is any clear data error in the column. An data error in the context of the column, can be values that are misspelled (typos), values that are formatted incorrectly, or values that are semantically incompatible with the rest of the column, etc., such that we can determine without ambiguity that such values are errors in the column. 

Since real-world data can vary widely in meaning and format, if you are uncertain whether a value is an error, please do not mark it as one. Only flag a value if you are confident that it is clearly a data error.

No explanation and return the final answer as a JSON object, {"obvious_error": "<CELL>"}. If you detect no error in the data, return {"obvious_error": null}.

Column:
| event data                                                                                                                                               |
|:---------------------------------------------------------------------------------------------------------------------------------------------------------|
| <roleid>-1</roleid><principalid>18</principalid><scope>8694e90d-5282-4b94-bde2-d81a811de1fc</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>8694e90d-5282-4b94-bde2-d81a811de1fc</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>8694e90d-5282-4b94-bde2-d81a811de1fc</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>8694e90d-5282-4b94-bde2-d81a811de1fc</scope><operation>ensure added</operation>           |
| <groupid>18</groupid><userid>1368</userid><username>i:0#.w|skanska\jcilla</username>                                                                     |
| <groupid>18</groupid><userid>135</userid><username>i:0#.w|skanska\david.bland</username>                                                                 |
| <roleid>-1</roleid><principalid>18</principalid><scope>112d98bc-2c68-49da-b202-0f56956eebb2</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>112d98bc-2c68-49da-b202-0f56956eebb2</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>112d98bc-2c68-49da-b202-0f56956eebb2</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>112d98bc-2c68-49da-b202-0f56956eebb2</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>685a49ce-0018-4130-b02d-bf44e0337753</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>685a49ce-0018-4130-b02d-bf44e0337753</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>685a49ce-0018-4130-b02d-bf44e0337753</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>685a49ce-0018-4130-b02d-bf44e0337753</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>e35dcaea-e99a-49c6-adf6-aa9b6c1ae1b5</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>e35dcaea-e99a-49c6-adf6-aa9b6c1ae1b5</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>e35dcaea-e99a-49c6-adf6-aa9b6c1ae1b5</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>e35dcaea-e99a-49c6-adf6-aa9b6c1ae1b5</scope><operation>ensure added</operation>           |
| <url>smart/bluebeam/lists/publishedfeed/ab922b82-8406-4e49-b17b-9057bdf09503</url><scope>fedc8d5c-81ee-4395-bc9b-58b7494913af</scope>                    |
| <groupid>2496</groupid><userid>582</userid><username>i:0#.w|skanska\cwhelan</username>                                                                   |
| <url>smart/pdp/access requests</url><scope>21e16596-5c96-470e-b5d4-51a21ea85141</scope>                                                                  |
| <roleid>1073741829</roleid><principalid>2538</principalid><scope>21e16596-5c96-470e-b5d4-51a21ea85141</scope><operation>ensure added</operation>         |
| <groupid>2540</groupid><userid>5</userid><username>c:0!.s|windows</username>                                                                             |
| <groupid>2540</groupid><userid>729</userid><username>i:0#.w|skanska\bgallagher</username>                                                                |
| <url>smart/sharepoint2013/sitepages/working.aspx</url><scope>15e4e841-c913-412c-aeb6-5be9284705aa</scope>                                                |
| <roleid>-1</roleid><principalid>18</principalid><scope>15e4e841-c913-412c-aeb6-5be9284705aa</scope><operation>ensure removed</operation>                 |
| <url>smart/catalog/insite portal program icons - quick reference guide.pdf</url><scope>93cd3521-dfb3-4c61-b7a1-f85807937dff</scope>                      |
| <url>smart/catalog/insite portal photo management for skanska users - quick reference guide.pdf</url><scope>5a87e17d-a2d3-494b-b955-ef0c2105d2bd</scope> |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>5a87e17d-a2d3-494b-b955-ef0c2105d2bd</scope><operation>ensure added</operation>           |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>93cd3521-dfb3-4c61-b7a1-f85807937dff</scope><operation>ensure added</operation>           |
| <roleid>1073741826</roleid><principalid>19</principalid><scope>5a87e17d-a2d3-494b-b955-ef0c2105d2bd</scope><operation>ensure added</operation>           |
| <roleid>1073741826</roleid><principalid>19</principalid><scope>93cd3521-dfb3-4c61-b7a1-f85807937dff</scope><operation>ensure added</operation>           |
| <url>smart/catalog/insite portal document management - quick reference guide.pdf</url><scope>188454d8-45d9-4b4e-9c6e-2e8c789ec036</scope>                |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>188454d8-45d9-4b4e-9c6e-2e8c789ec036</scope><operation>ensure added</operation>           |
| <roleid>1073741826</roleid><principalid>19</principalid><scope>188454d8-45d9-4b4e-9c6e-2e8c789ec036</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>5a87e17d-a2d3-494b-b955-ef0c2105d2bd</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>18</principalid><scope>93cd3521-dfb3-4c61-b7a1-f85807937dff</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>5a87e17d-a2d3-494b-b955-ef0c2105d2bd</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>93cd3521-dfb3-4c61-b7a1-f85807937dff</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>93cd3521-dfb3-4c61-b7a1-f85807937dff</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>5a87e17d-a2d3-494b-b955-ef0c2105d2bd</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>18</principalid><scope>188454d8-45d9-4b4e-9c6e-2e8c789ec036</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>188454d8-45d9-4b4e-9c6e-2e8c789ec036</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>188454d8-45d9-4b4e-9c6e-2e8c789ec036</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>18</principalid><scope>d7989df5-cd43-4b70-b165-8678af6e3cfa</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>d7989df5-cd43-4b70-b165-8678af6e3cfa</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>d7989df5-cd43-4b70-b165-8678af6e3cfa</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>d7989df5-cd43-4b70-b165-8678af6e3cfa</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>8ff2e35b-7d7c-4ae2-b3df-a535553f1470</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>8ff2e35b-7d7c-4ae2-b3df-a535553f1470</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>8ff2e35b-7d7c-4ae2-b3df-a535553f1470</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>8ff2e35b-7d7c-4ae2-b3df-a535553f1470</scope><operation>ensure added</operation>           |
| <url>smart/xpres/access requests</url><scope>d67968d6-9a1b-4c62-869a-31c62448d656</scope>                                                                |
| <roleid>1073741829</roleid><principalid>2494</principalid><scope>d67968d6-9a1b-4c62-869a-31c62448d656</scope><operation>ensure added</operation>         |
| <groupid>2496</groupid><userid>2641</userid><username>c:0+.w|s-1-5-21-181418603-413491667-474620416-198929</username>                                    |
| <groupid>2496</groupid><user>582</user>                                                                                                                  |
| <groupid>2495</groupid><user>245</user>                                                                                                                  |
| <groupid>2540</groupid><user>135</user>                                                                                                                  |
| <groupid>2540</groupid><user>1680</user>                                                                                                                 |
| <groupid>2540</groupid><user>1368</user>                                                                                                                 |
| <groupid>2540</groupid><user>729</user>                                                                                                                  |
| <groupid>2540</groupid><user>42</user>                                                                                                                   |
| <groupid>2540</groupid><userid>2641</userid><username>c:0+.w|s-1-5-21-181418603-413491667-474620416-198929</username>                                    |
| <url>smart/catalog/project document portal (pdp) wiki.aspx</url><scope>48f572fa-1b66-47c7-b792-340096009672</scope>                                      |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>48f572fa-1b66-47c7-b792-340096009672</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>48f572fa-1b66-47c7-b792-340096009672</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>48f572fa-1b66-47c7-b792-340096009672</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>48f572fa-1b66-47c7-b792-340096009672</scope><operation>ensure removed</operation>                 |
| <groupid>2539</groupid><userid>2655</userid><username>c:0(.s|true</username>                                                                             |
| <roleid>1073741826</roleid><principalid>2655</principalid><scope>ec132b9f-e3f6-4758-ae56-995ebada75ea</scope><operation>ensure added</operation>         |
| <groupid>2540</groupid><user>5</user>                                                                                                                    |
| <groupid>2540</groupid><user>2641</user>                                                                                                                 |
| <roleid>-1</roleid><principalid>2539</principalid><scope>ec132b9f-e3f6-4758-ae56-995ebada75ea</scope><operation>ensure removed</operation>               |
| <roleid>-1</roleid><principalid>2538</principalid><scope>ec132b9f-e3f6-4758-ae56-995ebada75ea</scope><operation>ensure removed</operation>               |
| <roleid>-1</roleid><principalid>2540</principalid><scope>ec132b9f-e3f6-4758-ae56-995ebada75ea</scope><operation>ensure removed</operation>               |
| <url>smart/docuproplanroom/access requests</url><scope>a863f15c-2641-432a-a208-e0e32e490e12</scope>                                                      |
| <url>smart/catalog/skanska safety access from ipad - quick reference guide.pdf</url><scope>4b9e2e2e-b2a4-4173-8b71-6e15e5fd80a4</scope>                  |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>4b9e2e2e-b2a4-4173-8b71-6e15e5fd80a4</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>4b9e2e2e-b2a4-4173-8b71-6e15e5fd80a4</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>4b9e2e2e-b2a4-4173-8b71-6e15e5fd80a4</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>4b9e2e2e-b2a4-4173-8b71-6e15e5fd80a4</scope><operation>ensure removed</operation>                 |
| <url>smart/catalog/introduction to salesforce for crm-short ver.mp4</url><scope>463f4a4c-b59d-4324-bd17-3e510c5dcf1d</scope>                             |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>463f4a4c-b59d-4324-bd17-3e510c5dcf1d</scope><operation>ensure added</operation>           |
| <url>smart/catalog/safety incident tracking new enhancements.mp4</url><scope>d2d273e5-e5ad-4bf8-9763-42d31398fd5a</scope>                                |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>d2d273e5-e5ad-4bf8-9763-42d31398fd5a</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>d2d273e5-e5ad-4bf8-9763-42d31398fd5a</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>d2d273e5-e5ad-4bf8-9763-42d31398fd5a</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>d2d273e5-e5ad-4bf8-9763-42d31398fd5a</scope><operation>ensure removed</operation>                 |
| <url>smart/catalog/safety incident tracking enhancements and new features.mp4</url><scope>abd295aa-b0f2-46e5-a0e1-e6cae6cb7896</scope>                   |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>abd295aa-b0f2-46e5-a0e1-e6cae6cb7896</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>abd295aa-b0f2-46e5-a0e1-e6cae6cb7896</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>abd295aa-b0f2-46e5-a0e1-e6cae6cb7896</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>abd295aa-b0f2-46e5-a0e1-e6cae6cb7896</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>2434</principalid><scope>9a1d0bde-1c50-46b6-b011-dae389a03e29</scope><operation>ensure added</operation>         |
| <roleid>1073741826</roleid><principalid>2435</principalid><scope>9a1d0bde-1c50-46b6-b011-dae389a03e29</scope><operation>ensure added</operation>         |
| <roleid>1073741826</roleid><principalid>2668</principalid><scope>9a1d0bde-1c50-46b6-b011-dae389a03e29</scope><operation>ensure added</operation>         |
| <roleid>1073741826</roleid><principalid>2437</principalid><scope>9a1d0bde-1c50-46b6-b011-dae389a03e29</scope><operation>ensure added</operation>         |
| <roleid>-1</roleid><principalid>2668</principalid><scope>9a1d0bde-1c50-46b6-b011-dae389a03e29</scope><operation>ensure removed</operation>               |
| <roleid>-1</roleid><principalid>18</principalid><scope>463f4a4c-b59d-4324-bd17-3e510c5dcf1d</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>463f4a4c-b59d-4324-bd17-3e510c5dcf1d</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>463f4a4c-b59d-4324-bd17-3e510c5dcf1d</scope><operation>ensure removed</operation>                 |
| <url>smart/catalog/pdp demo.aspx</url><scope>96e3eab5-9297-45a9-a70a-a38871873a62</scope>                                                                |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>96e3eab5-9297-45a9-a70a-a38871873a62</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>96e3eab5-9297-45a9-a70a-a38871873a62</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>96e3eab5-9297-45a9-a70a-a38871873a62</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>96e3eab5-9297-45a9-a70a-a38871873a62</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>18</principalid><scope>2376c323-f9d5-42c9-8593-958ea5288411</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>2376c323-f9d5-42c9-8593-958ea5288411</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>2376c323-f9d5-42c9-8593-958ea5288411</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>2376c323-f9d5-42c9-8593-958ea5288411</scope><operation>ensure added</operation>           |
| <url>smart/catalog/salesforce crm - quick reference guide.pdf</url><scope>8561c6ed-b8b2-424b-8512-4117bdcc77b5</scope>                                   |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>8561c6ed-b8b2-424b-8512-4117bdcc77b5</scope><operation>ensure added</operation>           |
| <roleid>-1</roleid><principalid>18</principalid><scope>8561c6ed-b8b2-424b-8512-4117bdcc77b5</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>8561c6ed-b8b2-424b-8512-4117bdcc77b5</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>8561c6ed-b8b2-424b-8512-4117bdcc77b5</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>18</principalid><scope>0ff7c841-0ad2-4e9f-b39e-7b8db60e2c87</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>19</principalid><scope>0ff7c841-0ad2-4e9f-b39e-7b8db60e2c87</scope><operation>ensure removed</operation>                 |
| <roleid>-1</roleid><principalid>21</principalid><scope>0ff7c841-0ad2-4e9f-b39e-7b8db60e2c87</scope><operation>ensure removed</operation>                 |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>0ff7c841-0ad2-4e9f-b39e-7b8db60e2c87</scope><operation>ensure added</operation>           |
| <url>smart/catalog/introduction to salesforce for crm - short ver.mp4</url><scope>4d92c862-464a-4ba7-9e91-b2f393ae7495</scope>                           |
| <roleid>1073741826</roleid><principalid>21</principalid><scope>4d92c862-464a-4ba7-9e91-b2f393ae7495</scope><operation>ensure added</operation>           |