Reset permissions
After changing permissions to folder still reciewve the same error
'A file permissions error has occurred. Please check the permissions on the script and the directory it is in and try again.'
The url of the message window is
index.php?uicolor=%23eee&theme=webassist_v2&showsidebar=true&startup_folder=cms_files&CKEditor=ContentValue&CKEditorFuncNum=1&langCode=en-gb