Unfortunately has stopped when using appcompat

Unfortunately has stopped when using appcompat

Now I'm using Android studio and try to use v7-appcompat.
I just updates my dependencies to
dependencies {
compile 'com.android.support:support-v4:18.0.+'
compile "com.android.support:appcompat-v7:18.0.+"
}
and change my Activity to extents ActionBarActivity
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
It has no error when I run this. But after execute app, I face into
'Unfortunately has stopped' message. I don't know what's wrong.
and this is log-cat.
07-23 22:08:00.001 784-784/com.android.exchange E/StrictMode: null
android.app.ServiceConnectionLeaked: Service
com.android.exchange.ExchangeService has leaked ServiceConnection
com.android.emailcommon.service.ServiceProxy$ProxyConnection@40d3a3a0
that
was originally bound here
at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:969)
at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:863)
at android.app.ContextImpl.bindService(ContextImpl.java:1418)
at android.app.ContextImpl.bindService(ContextImpl.java:1407)
at android.content.ContextWrapper.bindService(ContextWrapper.java:473)
at
com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:157)
at
com.android.emailcommon.service.ServiceProxy.setTask(ServiceProxy.java:145)
at com.android.emailcommon.service.AccountServiceProxy.getDeviceId
(AccountServiceProxy.java:116)
at
com.android.exchange.ExchangeService.getDeviceId(ExchangeService.java:1249)
at com.android.exchange.ExchangeService$7.run(ExchangeService.java:1856)
at
com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:551)
at
com.android.emailcommon.utility.Utility$2.doInBackground(Utility.java:549)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
07-23 22:08:00.001 303-868/system_process W/ActivityManager: Unbind
failed: could not find
connection for android.os.BinderProxy@41621520