How to resolve error ```Cannot add property 2, object is not extensible```

GoJS
1

Hi,
I am getting an error for the actions I am doing it on canvas. Like dragging the node from palette to canvas, or deleting a node or, deleting a link everything is giving me this error

Cannot add property 2, the object is not extensible
I am not able to understand what can be the error

2

Clearly something is misconfigured. What is your stack trace at the time of the error? What have you changed since your app was working?