java.lang.NoSuchMethodError: scala.collection.immutable.StringLike.toString

logcat.scala

E/AndroidRuntime(30638): FATAL EXCEPTION: main
E/AndroidRuntime(30638): java.lang.NoSuchMethodError: scala.collection.immutable.StringLike.toString
E/AndroidRuntime(30638):        at scala.collection.immutable.StringLike$class.toLong(StringLike.scala:230)
E/AndroidRuntime(30638):        at scala.collection.immutable.StringOps.toLong(StringOps.scala:31)
E/AndroidRuntime(30638):        at com.android.todoapp.Task$$anonfun$deserialize$1.apply(Task.scala:162)
E/AndroidRuntime(30638):        at com.android.todoapp.Task$$anonfun$deserialize$1.apply(Task.scala:160)
E/AndroidRuntime(30638):        at scala.collection.immutable.List.foreach(List.scala:309)
E/AndroidRuntime(30638):        at com.android.todoapp.Task.deserialize(Task.scala:160)
E/AndroidRuntime(30638):        at com.android.todoapp.Task$.deserialize(Task.scala:41)
E/AndroidRuntime(30638):        at com.android.todoapp.Tasks$$anonfun$getTasks$1.apply(Tasks.scala:36)
E/AndroidRuntime(30638):        at com.android.todoapp.Tasks$$anonfun$getTasks$1.apply(Tasks.scala:31)
E/AndroidRuntime(30638):        at scala.collection.immutable.List.foreach(List.scala:309)
E/AndroidRuntime(30638):        at com.android.todoapp.Tasks$.getTasks(Tasks.scala:31)
E/AndroidRuntime(30638):        at com.android.todoapp.Tasks$$anonfun$synchronize$1$$anonfun$apply$4.apply(Tasks.scala:77)
E/AndroidRuntime(30638):        at com.android.todoapp.Tasks$$anonfun$synchronize$1$$anonfun$apply$4.apply(Tasks.scala:74)
E/AndroidRuntime(30638):        at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)
E/AndroidRuntime(30638):        at scala.collection.immutable.List.foreach(List.scala:309)
E/AndroidRuntime(30638):        at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)
E/AndroidRuntime(30638):        at com.android.todoapp.Tasks$$anonfun$synchronize$1.apply(Tasks.scala:74)
E/AndroidRuntime(30638):        at com.android.todoapp.Tasks$$anonfun$synchronize$1.apply(Tasks.scala:74)
E/AndroidRuntime(30638):        at scala.Option.foreach(Option.scala:236)
E/AndroidRuntime(30638):        at com.android.todoapp.Tasks$.synchronize(Tasks.scala:74)
E/AndroidRuntime(30638):        at com.android.todoapp.MainActivity$$anonfun$3.apply(MainActivity.scala:140)
E/AndroidRuntime(30638):        at com.android.todoapp.MainActivity$$anonfun$3.apply(MainActivity.scala:133)
E/AndroidRuntime(30638):        at com.android.todoapp.MainActivity.synchronizeButtonHandler(MainActivity.scala:148)
E/AndroidRuntime(30638):        at com.android.todoapp.MainActivity$$anonfun$onCreate$2.apply(MainActivity.scala:59)
E/AndroidRuntime(30638):        at com.android.todoapp.MainActivity$$anonfun$onCreate$2.apply(MainActivity.scala:59)
E/AndroidRuntime(30638):        at com.android.todoapp.Implicits$$anon$5.onClick(Implicits.scala:23)
E/AndroidRuntime(30638):        at android.view.View.performClick(View.java:4232)