xml - R readHTMLTable failed to load external entity -


this question has answer here:

when run line on laptop, 

table500 <- readhtmltable('http://en.wikipedia.org/wiki/list_of_s%26p_500_companies')[[1]]

it gets data. when run on desktop, receive error 

error: failed load external entity "http://en.wikipedia.org/wiki/list_of_s%26p_500_companies".

so i'm guessing problem has network settings in desktop, haven't slightest idea though. suggestions?

in link mentioned in comment, can find solutions using rcurl , httr package. here, provide solution using rvest package. 

   library(rvest)     kk<-html("http://en.wikipedia.org/wiki/list_of_s%26p_500_companies")%>%     html_table(fill=true)%>%     .[[1]] //table 1  head(kk)   ticker symbol            security sec filings            gics sector                gics sub industry address of headquarters 1           mmm          3m company     reports            industrials         industrial conglomerates     st. paul, minnesota 2           abt abbott laboratories     reports            health care health care equipment & services north chicago, illinois 3          abbv              abbvie     reports            health care                  pharmaceuticals north chicago, illinois 4           acn       accenture plc     reports information technology   consulting & other services         dublin, ireland 5           ace         ace limited     reports             financials    property & casualty insurance     zurich, switzerland 6           act         actavis plc     reports            health care                  pharmaceuticals         dublin, ireland   date first added     cik 1                    66740 2                     1800 3       2012-12-31 1551152 4       2011-07-06 1467373 5       2010-07-15  896159 6                   884629

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