I believe the 908 error is tied to imap extensions not being enabled in php.ini file. If you have your server set to not display errors, you'll then see that error.
If you are receiving the 908 error go to your admincp -> Maintence -> View PHP Info
Under the heading of "Configure Command" you should see references to with-imap
If you DO NOT see that, you MUST edit your php.ini file and enable imap_extensions.
If your UNCERTAIN HOW TO EDIT YOUR PHP.INI FILE.... contact your host! Most hosts will have no issues enabling those commands