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What causes this issue?

A message is raised from an involved service e.g. '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 longtext of the
corresponding message e.g. for the message 'TR350: Request contains
tasks that are not released' call transaction SE91 for message class TR
and check the longtext of message number 350.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.