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As Dave mentioned, it seems that you are trying to access an add-on on the project and it's not loading.
Have you talked to your administrator to confirm if the add-on is updated?
What is the menu you are trying to access on the project?
@sumaiya_k - are you an admin for your Jira, or do you know the admin(s)? Is the test case add-on updated?
You're using TM4J, right? Make sure you have the right permissions to access test cases. Check: https://support.smartbear.com/tm4j-cloud/docs/get-started/setting-permissions.html
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