logcat

10-10 13:07:11.728: E/Trace(923): error opening trace file: No such file or directory (2)
10-10 13:07:12.109: D/dalvikvm(923): newInstance failed: no <init>()
10-10 13:07:12.132: D/AndroidRuntime(923): Shutting down VM
10-10 13:07:12.132: W/dalvikvm(923): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
10-10 13:07:12.368: E/AndroidRuntime(923): FATAL EXCEPTION: main
10-10 13:07:12.368: E/AndroidRuntime(923): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.offsetcalculator/com.example.offsetcalculator.MainActivity}: java.lang.InstantiationException: can't instantiate class com.example.offsetcalculator.MainActivity; no empty constructor
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.os.Looper.loop(Looper.java:137)
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.app.ActivityThread.main(ActivityThread.java:5041)
10-10 13:07:12.368: E/AndroidRuntime(923):  at java.lang.reflect.Method.invokeNative(Native Method)
10-10 13:07:12.368: E/AndroidRuntime(923):  at java.lang.reflect.Method.invoke(Method.java:511)
10-10 13:07:12.368: E/AndroidRuntime(923):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-10 13:07:12.368: E/AndroidRuntime(923):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-10 13:07:12.368: E/AndroidRuntime(923):  at dalvik.system.NativeStart.main(Native Method)
10-10 13:07:12.368: E/AndroidRuntime(923): Caused by: java.lang.InstantiationException: can't instantiate class com.example.offsetcalculator.MainActivity; no empty constructor
10-10 13:07:12.368: E/AndroidRuntime(923):  at java.lang.Class.newInstanceImpl(Native Method)
10-10 13:07:12.368: E/AndroidRuntime(923):  at java.lang.Class.newInstance(Class.java:1319)
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
10-10 13:07:12.368: E/AndroidRuntime(923):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
10-10 13:07:12.368: E/AndroidRuntime(923):  ... 11 more