The react-native building environment is wrong. Should the simulator environment be wrong? ?

  node.js, question

Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:

I have already followed the genymotion emulator and started a simulation. In addition, android studio and virtual box have been installed. What is it that is not configured?

You can try the following methods, see if they can work. I had a problem before and corrected it according to the following methods.

Modify genymotion-> settings-> ADB toolconnectionsettings to usecustomandardoid SDK tools and select the corresponding Android SDK directory.