There was an error uploading the file Symantec DLP

If you are getting "There was an error uploading the file" while trying to upgrade your DLP to newer version from Systems-->Overview-->Upgrade menu by using .jar file try the steps below. It's worked for me.

1) Create a folder named enforceupgrade under c:\Vontu\Protect\Updates
2) Extract the jar file by using winrar or winzip into this folder.
3) Run the start_upgrade_wizard.bat
4) Wait approximately 60 seconds for Tomcat to initialize properly
5) Open web browser and go to the URL https://yourenforceipadderss:8300
6) Log in by using administrator credentials and start the upgrade process.