请问这段代码有什么问题吗？ 刚接触r不久，期望指导。

> m2.arma52=arima(newup,order = c(5,0,2),fixed=c(NA,NA,NA,0,NA))
Error in stats:::arima(x = x, order = order, seasonal = seasonal, xreg = xreg,  :
  wrong length for 'fixed'