What steps from the documentation on how to troubleshoot apps have you followed? If you are having trouble following a specific step, please share details here, and someone can help.
As noted in this doc and nearly every similar previous post (1, 2, 3, and others), logs are the #1 troubleshooting tool for things like this. The document above suggests this and shows you an example of how to enable them and what they look like. You can share a screenshot of them here if they are not helpful for you, as they will be helpful to others helping you troubleshoot.
