You don't have permission to access...The error message is telling us that the editor does not have permission to talk to the necessary file. In other words the editor is trying to access a file but your servers file permission setting are not allowing this to happen. Every directory or file in the Linux file system contains settings for who can read, write or execute the file. These settings are called permissions. Each file or directory is assigned to a specific user and group.

The recommended sever-side requirements for Joomla to work correctly is:

• To use the file permission values, 755 and 0644 for folders and files respectively
• PHPsuExec, php_suexec or suPHP installed

For more help please see:

• For more information on Joomla’s and the editor’s system requirements please see the following documentation for help: - Read more...
• How to Change File Permissions in Joomla!: - Read more…