stephenonethree edited a comment on issue #8541:
URL: https://github.com/apache/airflow/issues/8541#issuecomment-833999533


   Ignore this, see my later comment for actual diagnosis
   
   _Incidentally in my case I had accidentally passed a parameter to one of my 
custom operators that was almost certainly not pickleable (I passed another 
operator to that operator as a parameter, instead of a string as I had 
intended). Then, I fixed that issue and went back to passing a string._
   
   _The bad code is nowhere to be seen at this point but I still have the 
issue. Is there any sort of parameter history from previous runs that might 
still be lurking in the database or something that could be causing this 
problem? If so is there a way I can clear that? Just a shot in the dark. (I'm 
not talking about XCOM)_


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