Hey,
We're facing as similar issue as this ticket which is still open, but not in Angular, and using version 5.1.
viewtopic.php?f=51&t=20489
When we add undo-redo functionality, and therefore the StateTrackManager,
and then try to create an event, this error pops in the console.
"Method cannot be called at this state".
Following this, there's lots of buggy behaviour with the undo-redo feature on the newly created activity.
However, there are no problems with moving already created activities, undo-redo works well in this case. Has the ticket seen progress that might help us?
