gettting system admin error when I do rest call on api/core/v3/people/@all

Hello everyone,

I am getting system admin error when  I do rest call for api/core/v3/people/@all . This was working fine all these days getting this error few days back.

I am using onpremise application with version 8.0.4.0 getting error as attached. Any information on this is highly appreciated.

Best regards,

Shobha