It's hard to tell from here what exactly is the problem.
The first message you received comes from the function validate() in /lib/editor/atto/adminlib.php
I suggest you set a breakpoint there and start debugging to find out the source of this message and then you'll be able to continue from there.
The first message you received comes from the function validate() in /lib/editor/atto/adminlib.php
I suggest you set a breakpoint there and start debugging to find out the source of this message and then you'll be able to continue from there.