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Diagnosing an IB API Connection Error Caused by Version Mismatch

Article vn.py community
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Summary

This short forum post concerns an error that repeatedly appears when connecting VeighNa, also known as VN.PY, to Interactive Brokers through the IB API. The traceback ends with a Python TypeError: the API invokes the wrapper’s error callback with more positional arguments than that callback accepts. The final note says the issue was resolved by using a stable version of the IB API.

The exchange points to a likely compatibility mismatch between the installed API and the trading framework’s callback definition. It does not identify the exact stable release, document the compatibility matrix, or describe the steps taken to change versions, so it is a narrow troubleshooting clue rather than a complete setup guide. For users facing the same symptom, the practical lesson is to check whether the installed IB API version matches the version expected by the framework, especially when callback signatures have changed. The post provides no information about order handling, brokerage behavior, or strategy performance.

Key ideas

  • The reported connection failure occurs when the API passes more arguments to an error callback than its definition accepts.
  • The post attributes the resolution to switching to a stable IB API version.
  • The symptom is consistent with a compatibility mismatch between the API package and the framework.
  • No specific version number or step-by-step repair procedure is provided.
  • The discussion concerns software connectivity rather than trading logic or performance.

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ExecutionFutures

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.