the error appears just after reloading cache
You haven't done what I asked to do, I'll repeat it again:
And, since the default error log might not be detailed enough to understand the issue, you should enable Logging in the troubleshooting page of the GSX settings, restart, recreate the error, and post the detailed log here.
Your log is still the less detailed one, which appears if you don't enable Logging, as explained above.