Why is the application compiled in Android Studio not installed on the phone?

Question

android studio

Good day.
I started to study android app development, made my first app, compiled it, tried to install it on my phone (Meizu M5, Android: 6.0), got this error:

I started digging into Project Structure, but it didn't lead to anything. Either it doesn't compile (if I set the Compile SDK Version to API 26: Android 6.0) or it doesn't install.
Here is the Project Structure at the moment:

And actually the question is, how can I compile this application so that this application runs on android 6.0?

Answer 1

M... Could it be that your applicationID / application name matches the existing one?
Or maybe you already installed such an application, but changed the applicationID / name? Then you need to uninstall the previous version and install from scratch.

Answer 2

Physically connect your phone via Usb and run it on the phone. And then compile.