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Need help…fast! What is this error?

  • On my site, I just installed a WordPress blog and was doing something with the PHP. Now I get this message on ALL my webpages in my site at the very top of the page…

    Warning: shell_exec() [function.shell-exec]: Unable to execute ‘/bin/hostname’ in /usr/lib/php/pre.php on line 8

    Can SOMEONE help me out? 🙁

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