I'm receiveing an error message as below; Warning: stat()

Hello;

I'm receiveing an error message as below;

Warning: stat() [function.stat]: stat failed for /home/....../public_html/wpINC/class-http.php in /home/....../public_html/wp-content/plugins/whmcs-wordpress-integration/whmcs-integration.php on line 457

Is there any solution to fix this problem,? If you could, I'm so appreciate...

Best;
Kerem Y.