[Xperia Z1 Q&A, Help & Troubleshooting] thegios:
I have the logcat ;)

It seems the problem is here:

Could not find method com.android.calendarcommon2.EventRecurrence.repeatsMonthlyOnDayCountAllowNeg, referenced from method com.android.recurrencepicker.Utils.getRepeatString

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FULL LOG

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11-05 16:12:28.725 I/ActivityManager(1160): Timeline: Activity_windows_visible id: ActivityRecord{46970318 u0 com.google.android.calendar/com.android.calendar.AllInOneCalendarActivity t13} time:7159580

11-05 16:12:28.765 I/dalvikvm(8135): Could not find method com.android.calendarcommon2.EventRecurrence.repeatsMonthlyOnDayCountAllowNeg, referenced from method com.android.recurrencepicker.Utils.getRepeatString

11-05 16:12:28.765 W/dalvikvm(8135): VFY: unable to resolve virtual method 12344: Lcom/android/calendarcommon2/EventRecurrence;.repeatsMonthlyOnDayCountAllowNeg ()Z

11-05 16:12:28.765 D/dalvikvm(8135): VFY: replacing opcode 0x74 at 0x020e

11-05 16:12:28.765 D/AndroidRuntime(8135): Shutting down VM

11-05 16:12:28.765 W/dalvikvm(8135): threadid=1: thread exiting with uncaught exception (group=0x42083d88)

11-05 16:12:28.775 E/AndroidRuntime(8135): FATAL EXCEPTION: main

11-05 16:12:28.775 E/AndroidRuntime(8135): Process: com.google.android.calendar, PID: 8135

11-05 16:12:28.775 E/AndroidRuntime(8135): java.lang.NoSuchMethodError: com.android.calendarcommon2.EventRecurrence.repeatsMonthlyOnDayCountAllowNeg

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.android.recurrencepicker.Utils.getRepeatString(Utils.java:133)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.android.calendar.event.segment.WhenSegment.updateWhen(WhenSegment.java:118)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.android.calendar.event.segment.WhenSegment.onRefreshModel(WhenSegment.java:64)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.android.calendar.event.EventInfoFragment.setView(EventInfoFragment.java:516)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.android.calendar.event.EventInfoFragment.onAllDataLoaded(EventInfoFragment.java:2398)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.android.calendar.event.EventInfoFragment.onQueryComplete(EventInfoFragment.java:2190)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.google.android.calendar.event.TimelyEventInfoFragment.access$100(TimelyEventInfoFragment.java:73)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.google.android.calendar.event.TimelyEventInfoFragment$LoaderCallbacks.finishLoader(TimelyEventInfoFragment.java:109)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.google.android.calendar.event.TimelyEventInfoFragment$3.onLoadFinished(TimelyEventInfoFragment.java:848)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.app.LoaderManagerImpl$LoaderInfo.callOnLoadFinished(LoaderManager.java:483)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.app.LoaderManagerImpl$LoaderInfo.onLoadComplete(LoaderManager.java:451)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.content.Loader.deliverResult(Loader.java:144)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.content.AsyncTaskLoader.dispatchOnLoadComplete(AsyncTaskLoader.java:265)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.content.AsyncTaskLoader$LoadTask.onPostExecute(AsyncTaskLoader.java:92)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.os.AsyncTask.finish(AsyncTask.java:632)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.os.AsyncTask.access$600(AsyncTask.java:177)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.os.Handler.dispatchMessage(Handler.java:102)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.os.Looper.loop(Looper.java:212)

11-05 16:12:28.775 E/AndroidRuntime(8135): at android.app.ActivityThread.main(ActivityThread.java:5135)

11-05 16:12:28.775 E/AndroidRuntime(8135): at java.lang.reflect.Method.invokeNative(Native Method)

11-05 16:12:28.775 E/AndroidRuntime(8135): at java.lang.reflect.Method.invoke(Method.java:515)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)

11-05 16:12:28.775 E/AndroidRuntime(8135): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)

11-05 16:12:28.775 E/AndroidRuntime(8135): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)

11-05 16:12:28.775 E/AndroidRuntime(8135): at dalvik.system.NativeStart.main(Native Method)

11-05 16:12:28.775 D/ActivityManager(1160): New dropbox entry: com.google.android.calendar, data_app_crash, 9c91e613-bb1a-404f-b4c5-56106d55c07c

11-05 16:12:28.775 W/ActivityManager(1160): Force finishing activity com.google.android.calendar/com.android.calendar.AllInOneCalendarActivity

11-05 16:12:28.885 D/dalvikvm(1160): GC_FOR_ALLOC freed 1843K, 12% free 76589K/86580K, paused 91ms, total 92ms

11-05 16:12:28.895 I/CrashMonitor(5631): CrashMonitorServiceBroadcastReceiver: Forwarding intent: android.intent.action.DROPBOX_ENTRY_ADDED tag: data_app_crash

11-05 16:12:28.895 I/CrashMonitor(5631): CrashMonitorService: Service started...