Loading .RData from Internet

I tried the load() already. It does not work. The erro is shown as following:

Error in readChar(con, 5L, useBytes = TRUE) : cannot open the connection
In addition: Warning message:
In readChar(con, 5L, useBytes = TRUE) :
  cannot open compressed file
'http://rss.acs.unt.edu/Rdoc/library/twang/data/raceprofiling.RData',
probable reason 'Invalid argument'

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