error in model frame default, variable lengths differ

I am adding the screenshot of the error, someone kindly helps.

What is your outcome variable in the model?

My suspicion is that you meant to write as.factor(training_data) (lowercase t ) instead of as.factor(Training_data) (uppercase T) in your formula. The first refers to a single column in your dataframe while the latter refers to the whole data frame thus giving an error.

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thank you so much, solved.