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?

[Pratik Khamkar]

It's a declarative action.

[Mark_Didrikson]

There is a known issue with running this as a Server Script. To resolve, you can use a standard UI Action with the following code in the Workspace Client Script section.

Also, check both of the following boxes:

Workspace Form Button

Format for Configurable Workspace

function onClick(g_form) {
    assignToMe();

    function assignToMe() {
        try {
            g_form.setValue("assigned_to", g_user.userID);
            g_form.submit(g_form.getActionName());
        } catch (ex) {
          //  alert("Error: " + ex);
        }
    }
}