An exception occurred when trying to issue security token in SharePoint

I have tried to open SharePoint portal with Claims Authentication that was worked properly! but Suddenly, I got the below error:

An exception occurred when trying to issue security token: The requested service, ‘http://localhost:32843/SecurityTokenServiceApplication/securitytoken.svc/ actas’; could not be activated. See the server’s diagnostic trace logs for more information.

I checked the log file and Event Viewer and seems that

Secure Token Service is failing Continue reading An exception occurred when trying to issue security token in SharePoint

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