Question: What does this error message in Maple exactly mean?

What does the error message, "Error, (in monspt) invalid input: ArrayTools:-Reverse expects its 1st argument, A, to be of type rtable, but received [[0, 4], [1, 3], [2, 2], [3, 1], [4, 0], [0, 3], [1, 2], [2, 1], [3, 0], [0, 2], [1, 1], [2, 0], [0, 1], [1, 0], [0, 0]]
" exactly mean, and how to find the required rtable type, and how to make it work? Thanks a lot!

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