Your webhost has secure mode on which means that you will have to change the permission and ownership of all files in eZ publish. I suggest you talk with your webhost and ask which user (and group) the webserver is running as, when you know that you can change the ownership by cd'ing to the eZ publish root and doing:
chmod -R webuser:webgroup *
for instance if the user and group is anonymous do: chmod -R anonymous:anonymous *