KB485790: Get pop-up null error message when running dossiers in MicroStrategy Library

Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
SYMPTOM:
When running a dossier in Strategy Library, users may get a pop-up dialog box with the “null” error.

From the fiddler log, the request POST /MicroStrategyLibrary/servlet/taskProc returns the error code 404:

CAUSE:
A possible cause of the problem is that the user account used to start Tomcat doesn’t have the permission to access “/MicroStrategyLibrary/jsp/taskProc”.
ACTION:

1. Restart Tomcat using the user account who has the read & execute permission to “/MicroStrategyLibrary/jsp/taskProc” and its content.
2. Or modify folder/file permissions and make sure the user account used to start Tomcat has at least the read & execute permissions to the folder “/MicroStrategyLibrary/jsp/taskProc” and its content.