Check Widgets Tool for Custom Widget -- Blank App

I have created a custom widget and it works fine when running locally. If I "Check Widgets" under the Project tab, I am told all widgets are built correctly. However if I "Bundle widgets when running locally" in the project's settings or try to deploy to the cloud, my app turns up blank (even on the home page that doesn't contain the widget). How can I check where the widget is failing?
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