Label Gadget from JIRA is not working in Confluence

Description

When the user tries to add the Label Gadget from JIRA to a confluence page, the user is not able to select the project list from the Label Gadget setting windows.

Steps to reproduce

1. Register the Label Gadget in Confluence
2. Create a confluence page
3. Try to add the Label Gadget to the confluence page
4. User not able to select the project from the Label Gadget setting window

Expected Behavior
The project list is shown and the gadget is successfully added to the confluence page

Actual Behavior