Web Reference: Nov 6, 2025 · Stuck with the invalid 'type' (character) of argument error in R? Our guide explains why this error occurs and provides clear, step-by-step solutions to fix it Jan 31, 2016 · Error in FUN (X [ [i]], ...) : invalid 'type' (character) of argument. That error is coming from sum(), because you are attempting to sum the character elements in the color column. You need to remove the color column from the x argument, since it is not being used in aggregation, but is actually the by argument. The most straightforward and reliable solution to the “invalid ‘type’ (character) of argument” error is fundamentally defensive programming: rigorously ensuring that arithmetic functions only receive input that is genuinely quantitative.
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