[R] nnet inappropriate fit for class error

[Duygu Gunaydin]

Hi,

I am trying to run a nnet algorithm but when I try to use the predict function with type='class', it gives the following error: 

fit <- nnet(y~., size = 1, data = train.set, rang = 0.5, maxit=200, decay = 0)

predict<-predict(fit,test.set,type='class')
Error in predict.nnet(fit, test.set, type = "class") : 
 inappropriate fit for class

I couldn't figure out the reason for this, are there any specifications to use type='class' that I am missing?

Thank you,

Duygu Gunaydin