Cause
This error occurs from collection operations that are passed the value of an entry that is expected to be in the collection but was not found.
The entry was never in the collection or it has already been removed. An example of this sort of operation is the
Action
Determine why the entry is not in the collection and correct the code that led to the error.
The method and source position containing the expression at which the exception was raised are reported in the error description.