Nothing is displayed when testing the app in run mode

Apologies in advance as I am a complete novice to coding and don't even know the basics. I have designed a UI for my dashboard page. I haven't done anything on the homepage of the app. But when I try to test the app in run or test mode, nothing is displayed except the app bar. I do not even have the app bar enabled on the dashboard page that I want to view. There are a bunch of errors in the console but I cannot make the heads or tails of them. When I try to open the URL for the app in run mode in edge, it just keeps loading forever and ever and doesn't load the page. Can someone help me see the problem and point out the solution?

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