I don't know a lot about this, but I know that file uploads can be tricky because of how permissions are set. You might try searching the InterAKT file management forums for "permissions."
You may also try FTP client software (Fetch, Captain FTP, Transmit, etc.) to view the directory into which you're trying to upload. An FTP client will show you hidden folders that DreamWeaver doesn't. Some FTP software also allows you to change file permissions.
Thanks for your help. The problem was tricky in fact, but is solved.
My permissions were set to 750 (not 777) but its ok.
The "insert server behavior" attach to the "upload multiple image" have the ID field to be inserted, and I have to remove that ID field from the insert server behavior, and this way, this error was desapear.
If someonelse have this problem, and can't understand my solution, please reply here, I will try better.