r - Error in predicting test data when apply prediction fda.model (flexible discriminant analysis) -

library(mda)

i'm using:

pred.test <- predict(model.fda, test.data)  after model.fda <- fda(y~., train.data) 

but obtained following message:

error in mindist[l] <- ndist[l] : nas not allowed in subscripted assignments.

thank hint!

i've solved issue after normalizing data (it binary values , maybe sparse in case).