that means that the application is already installed in the device (in the emulator in this case) but it's not compatible with the one you are going to install so it needs to uninstall it first. the android emulator is kind of buggy and we don't support it officially the easiest is to test applications in a real device but it might be that if the application is really installed you can probably uninstall it manually and try to run the application again from android studio
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