The function colorToGrayscale(picture) is supposed to take a JES picture object and return a grayscale copy of it. It uses an auxiliary function RGB2Y(c) which takes a color(!) c and returns a color of equivalent grayscale. The intended use of the main function on the command line is show(colorToGrayscale(picture)). (4 points) The program as written has an error. Both functions are syntactically correct, but an error is caused in the auxiliary function. Analyze the error message carefully. Find and fix any mistake(s) that prohibit the program from functioning as intended.

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