I encountered a runtime error I did not have before. I ran backtest of my algo that worked just fine, and this error is what I got. I can't figure out where it comes from.

Trying to retrieve an element from a collection using a key that does not exist in that collection throws a KeyError exception. To prevent the exception, ensure that the  key exist in the collection and/or that collection is not empty.  at wrapped_function    raise KeyError(f"No key found for either mapped or original key. Mapped Key: {mKey}; Original Key: {oKey}")  File "./cache/algorithm/project/main.py" in PandasMapper.py: line 75


Anyone having the same issue?