Please see the screenshot and let me know how I can resolve it.
It say’s missing build.wasm
Hi Prakhar,
Welcome to our community! 
Have you already tried to restart Unity and Visual Studio?
Yes, I have tried it. It is still showing the same error
The red errors still persist?
Those messages with the yellow icons are harmless warnings, probably caused by a bug in Unity. Double click on each message in your Console, and add = default; behind the respective variable declaration.
Yes, red errors still comes.
The yellow warnings are resolved.
The red error messages don’t refer to anything what you did. For this reason, it might be that there is an internal issue with Unity. I’ve just checked the Unity website, and there is a newer version of 2019.4. Maybe you could try to update Unity.
Okay, will update and let you know if the error still comes.
The issue has been resolved. It seems that I forgot to add scene when I clicked on switch platform. Hence, it did not created the build.wasm file.
I’m glad you solved the problem.
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