What does this mean "Special judge: No expected output available."?

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    As notes says, "If the order is invalid, return an empty string." but I return an empty string for invalid input, it prompts error which says "Special judge: No expected output available."? what should I return if it is invalid input??

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    Special judge is necessary when there could be different results, and for such problems the system doesn't seem to pick and show one.

    I suspect you're wrong about the input being invalid, though. Please show us the failed input and your code.

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