garch模型求解波动率

问题遇到的现象和发生背景

用Python写程序构造Garch模型求解波动率

用代码块功能插入代码，请勿粘贴截图

install.packages(fGarch)
install.packages(xts)
library(fGarch)
library(xts)
setwd("F://swdata")
raw<-read.csv("swdata.csv")
raw.xts<-xts(raw[,2:3],as.Date(raw$Date))
rt<-raw.xts$finance
arch1<-garchFit(1+garch(3,0),data=rt)
summary(arch1)
arch2<-garchFit(arma(1,1)+garch(6,0),data=rt,cond.dist="std")
summary(arch2)
garch1<-garchFit(formula=~arma(1,1)+garch(1,1),data=rt,cond.dist="std")
summary(arch1)
resid1<-residuals(arch2,standardize=T)
resid2<-residuals(garch1,standardize=T)
Box.test(resid1,type="Ljung-Box",lag=6)
Box.test(resid2,type="Ljung-Box",lag=6)
v=volatility(garch1)

运行结果及报错内容

第七行始终报错

我想要达到的结果

求解是为什么