Datasets:

tekkick
/

metatrader-error-codes

Error code:   DatasetGenerationCastError
Exception:    DatasetGenerationCastError
Message:      An error occurred while generating the dataset

All the data files must have the same columns, but at some point there are 4 new columns ({'mt4_name', 'diagnosis', 'mt5_retcode', 'mt4_error'}) and 4 missing columns ({'runtime_code', 'what_it_means', 'name', 'where_the_real_reason_is'}).

This happened while the csv dataset builder was generating data using

hf://datasets/tekkick/metatrader-error-codes/mt4_to_mt5_mapping.csv (at revision 63b9c5ddf6e76d33f5d11ab09b54c460d10f7741), ['hf://datasets/tekkick/metatrader-error-codes@63b9c5ddf6e76d33f5d11ab09b54c460d10f7741/mql_runtime_errors.csv', 'hf://datasets/tekkick/metatrader-error-codes@63b9c5ddf6e76d33f5d11ab09b54c460d10f7741/mt4_to_mt5_mapping.csv', 'hf://datasets/tekkick/metatrader-error-codes@63b9c5ddf6e76d33f5d11ab09b54c460d10f7741/server_retcodes.csv']

Please either edit the data files to have matching columns, or separate them into different configurations (see docs at https://hf.co/docs/hub/datasets-manual-configuration#multiple-configurations)
Traceback:    Traceback (most recent call last):
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1848, in _prepare_split_single
                  writer.write_table(table)
                  ~~~~~~~~~~~~~~~~~~^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/arrow_writer.py", line 765, in write_table
                  self._write_table(pa_table, writer_batch_size=writer_batch_size)
                  ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/arrow_writer.py", line 773, in _write_table
                  pa_table = table_cast(pa_table, self._schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2378, in table_cast
                  return cast_table_to_schema(table, schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2306, in cast_table_to_schema
                  raise CastError(
                  ...<3 lines>...
                  )
              datasets.table.CastError: Couldn't cast
              mt4_error: int64
              mt4_name: string
              mt5_retcode: string
              diagnosis: string
              -- schema metadata --
              pandas: '{"index_columns": [{"kind": "range", "name": null, "start": 0, "' + 749
              to
              {'runtime_code': Value('int64'), 'name': Value('string'), 'what_it_means': Value('string'), 'where_the_real_reason_is': Value('string')}
              because column names don't match
              
              During handling of the above exception, another exception occurred:
              
              Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1369, in compute_config_parquet_and_info_response
                  parquet_operations, partial, estimated_dataset_info = stream_convert_to_parquet(
                                                                        ~~~~~~~~~~~~~~~~~~~~~~~~~^
                      builder, max_dataset_size_bytes=max_dataset_size_bytes
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  )
                  ^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 948, in stream_convert_to_parquet
                  builder._prepare_split(split_generator=splits_generators[split], file_format="parquet")
                  ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1694, in _prepare_split
                  for job_id, done, content in self._prepare_split_single(
                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~^
                      gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  ):
                  ^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1850, in _prepare_split_single
                  raise DatasetGenerationCastError.from_cast_error(
                  ...<4 lines>...
                  )
              datasets.exceptions.DatasetGenerationCastError: An error occurred while generating the dataset
              
              All the data files must have the same columns, but at some point there are 4 new columns ({'mt4_name', 'diagnosis', 'mt5_retcode', 'mt4_error'}) and 4 missing columns ({'runtime_code', 'what_it_means', 'name', 'where_the_real_reason_is'}).
              
              This happened while the csv dataset builder was generating data using
              
              hf://datasets/tekkick/metatrader-error-codes/mt4_to_mt5_mapping.csv (at revision 63b9c5ddf6e76d33f5d11ab09b54c460d10f7741), ['hf://datasets/tekkick/metatrader-error-codes@63b9c5ddf6e76d33f5d11ab09b54c460d10f7741/mql_runtime_errors.csv', 'hf://datasets/tekkick/metatrader-error-codes@63b9c5ddf6e76d33f5d11ab09b54c460d10f7741/mt4_to_mt5_mapping.csv', 'hf://datasets/tekkick/metatrader-error-codes@63b9c5ddf6e76d33f5d11ab09b54c460d10f7741/server_retcodes.csv']
              
              Please either edit the data files to have matching columns, or separate them into different configurations (see docs at https://hf.co/docs/hub/datasets-manual-configuration#multiple-configurations)

Need help to make the dataset viewer work? Make sure to review how to configure the dataset viewer, and open a discussion for direct support.

runtime_code int64	name string	what_it_means string	where_the_real_reason_is string
4,752	ERR_TRADE_DISABLED	Trading by expert advisors is prohibited	Retcode 10027 — the Algo Trading button or EA permission
4,753	ERR_TRADE_POSITION_NOT_FOUND	The position ticket does not exist	Usually a netting account that has already merged the position
4,754	ERR_TRADE_ORDER_NOT_FOUND	The order ticket does not exist	Already filled, cancelled, or the wrong ticket
4,755	ERR_TRADE_DEAL_NOT_FOUND	The deal ticket does not exist	History not yet selected with HistorySelect()
4,756	ERR_TRADE_SEND_FAILED	The trade request was not sent, or was rejected	MqlTradeResult.retcode — any of the codes in the table above
4,758	ERR_TRADE_CALC_FAIL	OrderCalcMargin or OrderCalcProfit failed	Bad symbol, volume or price passed to the calculation
4,759	ERR_TRADE_WRONG_PROPERTY	Wrong trade property requested	A code error in the EA, not the broker
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	null	null	null
null	REQUOTE	null	null
null	REJECT	null	null
null	CANCEL	null	null
null	PLACED	null	null
null	DONE	null	null
null	DONE_PARTIAL	null	null
null	ERROR	null	null
null	TIMEOUT	null	null
null	INVALID	null	null
null	INVALID_VOLUME	null	null
null	INVALID_PRICE	null	null
null	INVALID_STOPS	null	null
null	TRADE_DISABLED	null	null
null	MARKET_CLOSED	null	null
null	NO_MONEY	null	null
null	PRICE_CHANGED	null	null
null	PRICE_OFF	null	null
null	INVALID_EXPIRATION	null	null
null	ORDER_CHANGED	null	null
null	TOO_MANY_REQUESTS	null	null
null	NO_CHANGES	null	null
null	SERVER_DISABLES_AT	null	null
null	CLIENT_DISABLES_AT	null	null
null	LOCKED	null	null
null	FROZEN	null	null
null	INVALID_FILL	null	null
null	CONNECTION	null	null
null	ONLY_REAL	null	null
null	LIMIT_ORDERS	null	null
null	LIMIT_VOLUME	null	null
null	INVALID_ORDER	null	null
null	POSITION_CLOSED	null	null
null	INVALID_CLOSE_VOLUME	null	null
null	CLOSE_ORDER_EXIST	null	null
null	LIMIT_POSITIONS	null	null
null	REJECT_CANCEL	null	null
null	LONG_ONLY	null	null
null	SHORT_ONLY	null	null
null	CLOSE_ONLY	null	null
null	FIFO_CLOSE	null	null
null	HEDGE_PROHIBITED	null	null

MetaTrader Error Code Cross-Reference

Three separate numbering systems describe the same failed order in MetaTrader, and nobody publishes the mapping between them as structured data. This dataset does.

System	Range	Where you see it
Server trade retcodes	10004-10046	`MqlTradeResult.retcode` after `OrderSend()`
MQL5 runtime errors	4752-4759	`_LastError` / `GetLastError()` inside the EA
MT4 error codes	129-4112	Older code, and most forum answers written before 2020

Why the mapping matters

An expert advisor that fails gets 4756 from _LastError, which means only "the trade request was not sent or was rejected". The reason is in MqlTradeResult.retcode — a completely different number. Developers routinely log the wrong one and lose the diagnosis.

Separately, a decade of forum answers is written in MT4 numbers. Someone reading that error 130 means an invalid stop needs to know it is 10016 on MT5. The conditions did not change when the platform did; only the numbering did.

Files

server_retcodes.csv — 41 rows. Every trade server retcode with its constant name and meaning.
mql_runtime_errors.csv — 7 rows. The MQL5 trade runtime errors, and where the real reason lives for each.
mt4_to_mt5_mapping.csv — 13 rows. MT4 error number to MT5 retcode, with the diagnosis.
metatrader_error_codes.json — all three as one object.

Source and method

Values are the standard MQL4/MQL5 documentation constants, compiled and cross-referenced while writing a public troubleshooting reference for MetaTrader 5. Nothing is inferred or estimated. The dataset is generated directly from the source of that reference, so the two cannot drift apart.

Full reference with diagnosis and fixes for each code: https://techkick.me/help/mt5-error-codes

Citation

Licensed CC BY 4.0. Reuse commercially, attribute, no permission needed.

@dataset{techkick_metatrader_error_codes,
  author    = {Tech Kick},
  title     = {MetaTrader Error Code Cross-Reference (MT4 / MT5 / MQL)},
  year      = {2026},
  publisher = {Zenodo},
  url       = {https://techkick.me/help/mt5-error-codes}
}

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