@Neha36 this sounds like a symptom of CAL data pgo file corruption. The best way to resolve this issue is to recreate your PGO files. Is this a single node or clustered environment? Are your PGO files stored on a SAN or NAS? Please see the following article:
It appears QVS is recreating the PGO files when it starts up. If this is after a server restart, you can try setting the QVS service to manual and give everything time to start on the server and then start QVS. This will tell you if QVS is coming online before everything is ready.
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If there are issues accessing the CalData.pgo file, we'd expect this to be recorded in the QVS Events log. In QMC > System > Setup > QlikView Server > QVS@ > Logging tab, ensure that the verbosity level is set to High and it is recommended that you split files daily (so much easier to read this way). In the same Logging tab, check the location listed in Log Folder for where you have configured the logs to be stored. The default location is %ProgramData%\QlikTech\QlikViewServer.
Something else to note, the master copy of the .pgo files is stored in the Root folder, as configured in QMC > System > Setup > QlikView Server > QVS@ > Folders, and each QVS node has a secondary (backup) location stored in %ProgramData%\QlikTech\QlikViewServer. It's a good idea to make regular backups of the .pgo files in case you run into your issue in the future.
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