That error is from not having curl configured on the server
If this is with a hosting company, you will need to have them install/enable it.
If this is a Windows based system, CURL can be enabled by uncommenting the curl extension line in the php.ini file - extension=php_curl.dll and restarting the web server.
If this is Unix/Linux, PHP must be compiled with CURL support and the libcurl library must be installed.
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