Why is this app not working on emulator(On PC)?

My app(Video calling app with Agora) is not working on emulator(Bluestacks.).
Why? Can anyone please help me out.

I think you are using an old version of Emulator with android version less than 4.4. If that so you can’t test or install your app in such emulator. Consider upgrading to the latest version.

Can you show us the blocks?