需要一些股票的数据，其他的都可以获取，只有601318获取不了
setSymbolLookup(PA=list(name="601318.ss",src="yahoo"))
getSymbols("PA",from="2014-03-30",to="2015-03-31")

显示为
Error in download.file(paste(yahoo.URL, "s=", Symbols.name, "&a=", from.m,  :
  cannot open URL 'http://ichart.finance.yahoo.com/table.csv?s=601318.ss&a=2&b=30&c=2014&d=2&e=31&f=2015&g=d&q=q&y=0&z=601318.ss&x=.csv'
In addition: Warning message:
In download.file(paste(yahoo.URL, "s=", Symbols.name, "&a=", from.m,  :
  cannot open: HTTP status was '0 (nil)'

求大神指导