Assignment 2 dispatcher problem

I have recently completed assignment 1 of level 3 and I am on assignment 2 now however I am facing some issues.
I have prepared the dispatcher workflow however I am getting error.

Attached is the workflow for get transaction data… Can someone guide me where I am going wrong.

If you have not fond a solution yet. The issue is in the invoke activity for GetTransactionData
there you have you need to click on import arguments first to refresh the arguments as it seems you have changed the type in_TransactionNumber or may have assigned a Int type value due to which you are getting this error.

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