Hi iFidelis,

Did you set the "action" setting in the view page code? If this setting is not necessary for you, then please remove it and try again.  

Also, I suggest you use the same way as the mvc demo to initialize the editor, it should fix this error for you. In the demo, it using the method below to initialize the editor.

protected Editor PrepairEditor(Action<Editor> oninit) {}

Regards,

Ken