This could happen if you have two entries like in your AndroidManifest.xml. If you choose File -> New -> Activity -> Blank Activity this gets included in manifest file automatically. If you are not building for wearable you can delete this from manifest file or add missing library in build.gradle (app)
<uses-library android:name="com.google.android.wearable" android:required="true" /> <!-- Set to true if your app is Standalone, that is, it does not require the handheld app to run. --> <meta-data android:name="com.google.android.wearable.standalone" android:value="true" />
This could also happen when your app expecting a library which is not installed yet. Please update your build.gradle for any missing library.