Warning: Realpath(): Open_basedir Restriction In Effect PHP Help, Realpath() Has Been Disabled?

PHP Help, Realpath() has been disabled? - warning: realpath(): open_basedir restriction in effect

I try to start a script from a website, but when I load a page that receives this error

Warning: realpath () has been disabled for security reasons in / home / www surftest.awardspace.com / Installation ... on line 7

I did not write the script, and have little experience with PHP. Can I solve this problem? Does anyone know this? Thank you in advance.