Create a blank text file on your local computer with something like notepad, notepad++, gedit etc. (not with Word, Writer or any other word processor).
Save it with the file name ’config.inc.php’, making sure that it does not end up as a text file like ’config.inc.php.txt’---it
must be a php file.
Use an FTP program like
FileZilla to access your site via FTP (if you’re not doing this already you can get the settings from your host). Navigate to the /manager/includes/ directory of your site on the right hand side, and to the blank text file on the left hand side, then drag the file from the left to the right pane. Now wait for it to upload, then right click on it and select ’File Permissions...’. Set the ’Numeric value:’ field to 666 and click OK.
The problem should be solved.