An unhandled error has occurred. Reload

I am new to GitHub and Blazor WASM. I am a WinForm developer and converted a Visual Studio (VS2019) WinForm to WASM using BlazorWebAsembly, NetCore 5.0 with VS2019.

This is on BlazorWAMapp1. The Page loads from VS2019 using IIS fine but via Browser I get a β€œAn unhandled error has occurred. Reload πŸ—™β€

Can anyone provide help? thanks

Thank you for your help. site is up after 2nd attempt following your suggestion to try tutorial: How to deploy ASP.NET Blazor WebAssembly to GitHub Pages (swimburger.net)