Error Unable to initialize embedded module for Gantt

Document ID : KB000098869
Last Modified Date : 30/05/2018
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Issue:
Receiving below error when opening Gantt after upgrading PPM

Unable to initialize embedded module for Gantt. 
Use the Refresh icon to complete the module initialization.
Environment:
15.4
Cause:
Browser Cache and PPM Server Cache contain items from previous version
Resolution:
Clear PPM Cache -
https://comm.support.ca.com/kb/refresh-ca-ppm-server-cache/kb000098199

Clear Browser Cache
https://comm.support.ca.com/kb/ca-ppm-how-to-flush-the-browser-cache/kb000023812