Unable to execute already existing workflow on t3 instance(AE 6.0) : Failure in submitting the request.

Unable to execute already existing workflow on t3 instance(AE 6.0) : Failure in submitting the request.

issue: Unable to execute already existing workflow on t3 instance: Failure in submitting the request.
AE version: 6.0



Solution:
We have follow the below steps. 
1. Stop the agent
2. Restart agent again
3. Unassigned the assigned workflows
4. Wait for some time & then assign workflows again to the agent
5. Submit the request

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