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error Failed to install the app. Make sure you have the Android development environment set up: https://facebook.github.io/react-native/docs/getting-started.html#android-development-environment. Run CLI with –verbose flag for more details.

Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

Unable to install C:\Users\you\Desktop\YourApp\android\app\build\outputs\apk\debug\app-debug.apk

com.android.ddmlib.InstallException: INSTALL_FAILED_UPDATE_INCOMPATIBLE: Package com.yourapp signatures do not match previously installed version; ignoring!

O man, what a doozy!?! Okay so here’s what’s probably going on, or at least what has been going on the several times I’ve run into this error. I happen to do development on several different computers, but use the same physical android device to test my app. So what happens is, the signature attached to the app installed on our physical android device, doesn’t match the signature of the computer that we’ve moved to and are now working.

However, the fix is fairly simple. All you need to do is delete the app from your physical device, then re-build/run your app again and all shall be well!

$ npx react-native run-android

or…

$ react-native run-android