Failed to load resource: the server responded with a status of 500 () code example

Example 1: failed to load resource: the server responded with a status of 404 (not found)

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Example 2: failed to load resource the server responded with a status of 400 ()

The answer was the Wrapper class. It couldn't assign values to it and threw error because i set attributes to "private". Setting them "public" solved it for me.

Can't believe that was the error...