“FileNotFoundException” like below is raised for a few files during T24.PRE.RELEASE on upgrade to R21 release. [WARN ] 2021-11-14 16:52:12,791 [T24_PRE_RELEASE_1390346246] DATABASE {COMO-NAME=T24.PRE.RELEASE, command=T24_PRE_RELEASE, sessionId=1390346246} – FileNotFoundException: java.io.FileNotFoundException: Error while opening file : ‘F.TSA.SERVICE$DEL’ / File not found : ‘F.TSA.SERVICE$DEL’ at CONVERSION.DETAILS.RUN : 440