Appmaker Unexpected client error. EditorLauncher SEVERE: Unexpected error - google-app-maker

I'm having a problem on appmaker, I can't seem to open load appmaker and by extension, cant load my projects.
What I already tried:
accessing 2 different projects with two different accounts of the same domain ( one is the owner of the two projects and the owner a normal dev account with given access )
opening appmaker from chrome incognito window and other browsers
opening appmaker using an account from another domain the the first two
All these attempts always give me the same error which is:
com.google.apps.appmaker.client.editor.EditorLauncher
SEVERE: Unexpected error
com.google.apps.appmaker.shared.property.binding.BindingException: Unexpected error on binding initial sync write
I added a some screenshots to show the error. I really dont know whats up, any hints or help would be appreciated !
thanks !

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