Fayiz Qadri

Noosh Can you please verify that the Custom Object feature is enabled in your account? You can do so by following this guide (https://developer.zendesk.com/documentation/custom-data/v2/getting-started-with-custom-objects/#activating-custom-objects)
 

HI Dan Savage, You had previously created a template and assigned training using it. However, you later deleted the template while the assigned training remained, which caused the issue. I have resolved it for you, and it should be working now.