Is this just informational errors you are getting or does it prevent you from using the editor? Have you checked to ensure that all of the HTML Editor files have been uploaded?
If you are using IE as your browser and only get these errors there you can go to Tools > Internet Options > Advanced. In here look for the following setting:
display a notification about every script error
You can uncheck this option to make sure you do not see notifications for all of the script errors if they are not affecting the functionality of the page.