Unfortunately app name has stopped

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http://stackoverflow.com – Ive been through alot of examples but still cant find a solution. Im new to android development so im following basic tutorials online. Everytime im starting the App on the AVD it says "Unfortunately app has stopped". AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.androidbmi" android:versionCode="1" android:versionName="1.0" > <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-sdk android: (HowTos)