Hello Community,
I have my custom topic created created but don't know for what reason the topic is not working as expected. So, I decided to delete some node and re-create but surprisingly I am not able to do anything(edit) to this topic.
Yes, I have checked the scope. The scope is correct.
Whenever I trying to delete any independent node, I am getting below mentioned error.
Please guide, how can I resolve this.
Thanks much in advance!
The error
 
Just had this issue - no idea why - and was able to clear it up by tweaking the sys_cb_topic "Graph" (JSON definition of the entire flow)...
In my case, it was a dangling topic block that had no connection after it and it wouldn't let me connect it to the "End" or delete it or even update its name (which wasn't unique, but shouldn't matter). Start by copying the "Graph" data into Notepad++ or JSON Viewer Online - and save a backup of the JSON just in case...
In the JSON, each node has an object and there's an object for each "Edge" (connection between nodes) as well. I noticed that my problematic topic block was connected to an "ImplicitEnd" node so what I did was change that "target" to the sys_id of the proper "End" ("TerminateGoal") node to force the connection.* Be prepared, you're gonna need to do a couple Ctrl-F's to see which sys_id is which... When updated, select all, copy, then paste back into the sys_cb_topic record, then reopen it in VA Designer - it showed connected to the End for me (as desired) and now it's editable and deletable.
I'm sure your circumstance is slightly different, but you may be able to try to follow the same principle - update the "target" node to something else (i.e. End) - and see if that nudges it properly.
Edit: Turns out you also need to delete the "ImplicitEnd" node from the JSON (pictured below) - otherwise VA Designer will throw an error at you when you try to Test or Publish
