I have been seeing this error more frequently as cPanel issues updates.

The reason is because there are some new security features within cPanel that change the way access to directories are handled.

No longer should, or in this can can, set a directory/file to 777.  Take a look at your directories and make sure that the following are set to 755:

/components
/components/com_mh2shoutbox
/components/com_mh2shoutbox/includes
/administrator/components
/administrator/components/com_mh2shoutbox