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

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

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