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> For a complete documentation index, see https://ibkrcampus.com/docs/tws-api/doc/error-handling/llms.txt.

# Error Handling

## Docs

- [Introduction](https://ibkrcampus.com/docs/tws-api/doc/error-handling/introduction.md)
- [Understanding Message Codes](https://ibkrcampus.com/docs/tws-api/doc/error-handling/understanding-message-codes.md)
- [System Message Codes](https://ibkrcampus.com/docs/tws-api/doc/error-handling/system-message-codes.md)
- [Error Codes](https://ibkrcampus.com/docs/tws-api/doc/error-handling/error-codes.md)
- [Receiving Error Messages](https://ibkrcampus.com/docs/tws-api/doc/error-handling/receiving-error-messages.md)
- [Introduction](https://ibkrcampus.com/docs/tws-api/doc/error-handling/common-error-resolution/introduction.md)
- [Market data farm connection is OK](https://ibkrcampus.com/docs/tws-api/doc/error-handling/common-error-resolution/market-data-farm-connection-is-ok.md)
- [Requested market data requires additional subscription for API. See link in 'Market Data Connections' dialog for more details.Delayed market data is available.](https://ibkrcampus.com/docs/tws-api/doc/error-handling/common-error-resolution/requested-market-data-requires-additional-subscription-for-api-see-link-in-market-data-connections-dialog-for-more-details-delayed-market-data-is-available.md)