Resolving Error: Assertion on 'x' failed: Must be of type 'data.frame', not 'logical'.

[DeFilippis]

I'm getting the following error, and it's not clear how to resolve this:

Error in marginalPrediction(sample.features[, -c("revenue_log_s")], "empcount_s",  :
  Assertion on 'x' failed: Must be of type 'data.frame', not 'logical'.

I successfully fit a randomForest model, and then call marginalPrediction like so:

mp = marginalPrediction(data[, -c('revenue_log_s')], 
                        "empcount_s", 
                        c(10, nrow(data)), 
                        fit)

I'm not sure what 'x' is referring to, as the data I pass in the first row is a dataframe, and I'm sure that the second argument is supposed to be a character vector, and not a dataframe.

Any thoughts?

[DeFilippis]

Figured it out. data was both a data.table and a data.frame. This throws an error. Also throws an error with the imp library. Re-cast data as a dataframe and it will work