[CMX_CMGSCCC]

You must not have the files uploaded to the proper locations, the only way this error will come up is if.

// check if the file needed to be included is uploaded
if (!file_exists(DIR . '/includes/functions_vbplaza.php'))
{
	// display the error (terminates the script too)
	print_dots_stop();
	print_stop_message('vbplaza_functions_vbplaza_not_uploaded');
}

If it can not find the file functions_vbplaza.php file inside of your forums/include folder.

-CMX