Error List: Operation is not a valid due to the current state of object

Help Activities
, ,
1

while using config file in the test case workflow and click run it suddenly this error was shown. I do not how to clear the error
Can u anyone tell about the reason why its shown like this?

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2

Can u plz anyone quick rply for the msg?

3

Can you show us the workflow. Is the Dictionary instantiated

4

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Are u asking this @Che bro?

5

Can u plz rply @Che bro