各位大佬可以帮忙解释下这个报错吗
模型：model2<-garchFit(~arma(1,1)+garch(1,1),data=diffdata,trace=F)
Warning message:
Using formula(x) is deprecated when x is a character vector of length > 1.
Consider formula(paste(x, collapse = " ")) instead.
怎么解决呀