Can't customize theme

  • Hello, everything is working nice until I update to 4.5.3.

    When I want to customise any theme I get this:

    The steamshopsrbija.com page isn’t working

    steamshopsrbija.com is currently unable to handle this request.
    HTTP ERROR 500

    Can you tell me whats wrong and how to fix that, thanks! ??

    [ No bumping please. ]

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