[R] unidentified option(s) in mean.model

[Allan Tanaka]

So i tried brute force to find best fitted GARCH model for prediction.The code works fine as it runs but at the end of processing, there's error like this: There were 50 or more warnings (use warnings() to see the first 50).
So i type warnings(), then the error become:unidentified option(s) in mean.model 
Not sure what's gone wrong?
See attached for R script