DefaultErrorTemplate on tyk

Please advise what this error could be due to. Client returns 500 error and proxy DefaultErrorTemplate error in log

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Hi @ignashkins,
Thank you for posting your question in our community. Upon checking, it seems that Tyk doesn’t return that response. From the little snippet that we can see, it seems that it is possible that the error was being returned by the upstream. For us to be sure and check further, can you please describe more what requests are you making and also provide us your API Definition?

I apologise, it really was an upstream error.