Error: Bad JSON response: SyntaxError: Unexpected token < in JSON at position 0

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I try to upload an intro clip but I always receive this message:
Error: Bad JSON response: SyntaxError: Unexpected token < in JSON at position 0

What I am doing wrong?
I try to upload an intro clip but I always receive this message:
Error: Bad JSON response: SyntaxError: Unexpected token < in JSON at position 0

What I am doing wrong?

Whats wrong with the support team? I have found 3 entries for this Problem but all three entries are unaswered. Please give us an answer to our questions. Not to answer to a post is not friendly.