500 Backend Error

Hi!

I have a blog portal that fetches a number of blogs and posts from blogger, 
for two days now I have received an 500 backend error on most of the blogs, 
but not everyone.

Here is error message, any idea what causes the problem. I tried it from 
the browser with my API key and mostly it works on the first couple of 
times and the error pops up again.


   - error: 
   {
      - errors: 
      [
         - 
         {
            - domain: "global",
            - reason: "backendError",
            - message: "Backend Error"
            }
         ],
      - code: 500,
      - message: "Backend Error"
      }
   



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