AEM 6.5 - 503 error every time server is initialize

I am facing 503 AuthenticationSupport service missing. Cannot authenticate request error every time server is started. This happened many times. There is no such broken error information on the error log file. I have even deleted the repository but didn't help much. I even use oak but still no use. I had set up it multiple times to skip this error but I don't feel confident with this approach. For better information, I am attaching the latest error log file.
https://drive.google.com/file/d/1aXEcZP_Tvk1ebBxfOmR9Q1ffk2KLeW66/view?usp=sharing
NOTE: I am a beginner in AEM. Please be gentle😁



