I need some help!!!!

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Hy guys I just try to upload my site script and setting up, but when i upload by FTP everuthing and try to connect to the admin platform show me this Warning: shell_exec() has been disabled for security reasons in /home/a2564571/public_html/lib/lib_functions.php on line 12 How can i fix this, because is even not let me log in to the admin site