C5.0 decision tree - c50 code called exit with value 1

Question

I am getting the following error

c50 code called exit with value 1

I am doing this on the titanic data available from Kaggle

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Answer 1

I also got the same error, but it was because of some illegal characters in the factor levels of one the columns.

I used make.names function and corrected the factor levels:

levels(FooData$BarColumn) <- make.names(levels(FooData$BarColumn))

Then the problem was resolved.