If you get the following error when you open your board, you need to correct the configuration. The main reason for this error is that the workflow states of work item types added to the Requirement category aren't mapped to the column.
Select Correct this now to open the Settings dialog.
In the following example, two new states are added: Triaged for bug, and Investigate for user story. Each state is then mapped to an existing or new column. After each state is mapped to a column, the board displays the work items assigned to these states.