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What causes this issue?

A message is raised from an involved service, for example, 'TR350:
Request contains tasks that are not released'

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

To get more details<(>,<)> call transaction SE91 and check the long text
of the corresponding message.
Example: For the message 'TR350: Request contains tasks that are not
released'<(>,<)> call transaction SE91 and open the message class TR.
Check the long text of the message number 350.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.