Certification result failed dispature and performer - Failed

Hi all,

I have taken my certification practical exam and my question is regarding dispature and performer. I have created two separate workflows for both and it’s working exactly which i want, but still i got result failed with some errors. Can anyone help me to resolve this issues or guide me what exactly i want to do. I upload my result screenshot below.

Failed Criteria :
Check TransactionItem Varaible and arguments data type to be the correct one,
Please make sure you’ve read the statement of the exercise and clearly understood it and also used the proper URL and credentials for ACME,
Please make sure you have properly named your input activities.,
Please make sure you have properly named your output activities.,
Please make sure you’re using the most optimal and correct way of interacting with your queue items.,
Check for validation of correct items

This is my Actual error screenshot.