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Random forest doesn't go well with missing values and create gibberish error results for Alteryx users.
Here are two quick options better to add the new version;
1) na.omit, which omits the cases form your data when tere a re missing values... you loose some observations though...
na.action=na.omit
2) na.roughfixreplaces missing values with mean for continuous and mode for categorical variables
na.action=na.roughfix
Best
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