Error in declarative action "JSONObject["value"] not found."

[Pratik Khamkar]

I have created a declarative action "Assign to me" on sc_task table. This will visible when current logged in user is part of assignment group and if state of sc_task is open. This declarative action is working fine for some assignment group members. But for few groups when I click on it then it is giving me error message  "JSONObject["value"] not found.".

Can someone please help me the reason behind this issue and help me in resolving this issue?

[Brad Bowman]

It would be helpful to show the declarative action you created.

[Ankur Bawiskar]

@Pratik Khamkar 

is that a normal UI action with Workspace Form button checkbox enabled?

share screenshots of that UI action or Form Action

If my response helped please mark it correct and close the thread so that it benefits future readers.