After upgrading, when I try to open the Management Portal, I get ERROR #5001 and cannot open it

InterSystems FAQ rubric

After upgrading your system, you may receive the error below when you try to open the Management Portal:

ERROR #5001: Server version of object does not match version sent from the client: %ZEN.Component.vgroup

This error is caused by outdated information remaining in your browser's cache.

You can resolve the error by clearing your browser's cache.