How do i fix the error?
What error code are you getting?
006-1204 thats the error code
What is it that you’re trying to do in Super Mario Maker? It may be that you’re accessing an unsupported feature
And to answer the question in your title, “Why does Mario Maker service have errors sometimes?”, the Mario Maker servers are very unfinished, Pretendo in general is not finished and as Jon has said specifically about SMM servers:
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