Test Environment - Application throws “System error. Contact system administrator.”

Document ID : KB000111610
Last Modified Date : 19/08/2018
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After upgrading the environment to 15.4.1, the application throws “System error. Contact system administrator.” when I navigate to the Resource List View. 
We found these error messages in the app-ca.log file:

Error message: [CA Clarity][Oracle JDBC Driver]Error writing data to client-side row cache. Verify that the directory specified by the java.io.tmpdir property exists and the current user has permission to read from and write to that directory. 
SQL error code: 0 

Error message: [CA Clarity][Oracle JDBC Driver]IO Error writing temp file: No space left on device
The SaaS OPS team cleared some old log files from the NAS drive supporting the APP server because it was full and then restarted PPM services.