[R] train function in caret package

[Elahe chalabi]

Hi all,

I'm running train function from caret package on my data set patientdata:

    model=train(type~., data=patientdata, method="lvq", preProcess="scale", trControl=control)
and I get this error:

    Error in comp(expr, env = envir, options = list(suppressUndefined = TRUE)) : 

     could not find function "mayCallBrowser"
Does anyone know how should I solve it?!

Thanks for any help!
Elahe