r - Error: failed to load external entity -

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this question has answer here:

i'm pretty new r. i'm trying run script site. http://www.thertrader.com/category/trading-strategies/

i've gotten far (not far @ all).

library(tseries) library(quantmod) library(xml)  startdate <- "2005-01-01" tables <- readhtmltable("http://en.wikipedia.org/wiki/list_of_s%26p_500_companies")

error: failed load external entity

can me working?

there seems weird error in way readhtmltable trying access internet (i'm getting same error). workaround, try using httr download , parse using readhtmltable:

library(httr) tables <- get("http://en.wikipedia.org/wiki/list_of_s%26p_500_companies") tables <- readhtmltable(rawtochar(tables$content))

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