How to Fix Stuck on Loading on Home Screen?

Hello! How can I Fix, Whenever I Test my Chatting App I got always stuck on the Home Screen (Where you can See Messages) I have 3 Screen the First 1 is Login & Signup Screen, The Second One is the Home Screen Where you can See Online Users Available, and the Third Screen is the Chat. When I Successfully Logged in, It’s not Showing Me the Online Users. it’s just showing me Loading. I use Spreadsheet, Firebase Database, TinyDB, and Firebase Authentication. I store Log in Info to Spreadsheet and Firebase Database.

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This is on the Home Screen Blocks where am Stuck on Loading
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This is the Problem

Can you Fix it?