AE - Workflow "ready for start" for a long time with "Waiting for user input" error

Document ID : KB000105205
Last Modified Date : 16/07/2018
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Issue:
Workflow don't run with status "ready for start"(Blue) and "Waiting for user input" error in Detail tab. 
Cause:
Child tasks inside the workflow are waiting for data from user to run.
Resolution:
Choose the option "Request User Input" in job that need user intervention.
Additional Information: