Based on your other post, it sounds like you cloned the contact form but you are coding against a different version of mojoPortal on your dev machine than what you have deployed on your server.
In the latest version of the contact form we use this overload of the SetupEditor method. You should update your clone to also use it:
SiteUtils.SetupEditor(edMessage, WebConfigSettings.UseSkinCssInEditor, ContactFormConfiguration.OverrideEditorProvider, true, false, Page);
and if you are developing from source code and especially if working from the repository and using the latest code you should consider learning how to deploy the whole thing including the build of mojo code and your custom features.
Hope it helps,
Joe