Xamarin Settings java.lang.Boolean cannot be cast to java.lang.String

txt

{Java.Lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <896ad1d315ca4ba7b117efb8dacaedcf>:0 
  at Java.Interop.JniEnvironment+InstanceMethods.CallObjectMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00069] in <7cfbebb561c54efc9010b018c0846c7e>:0 
  at Android.Runtime.JNIEnv.CallObjectMethod (System.IntPtr jobject, System.IntPtr jmethod, Android.Runtime.JValue* parms) [0x0000e] in <e975227ac8644a30bb0866117325de0d>:0 
  at Android.Content.ISharedPreferencesInvoker.GetString (System.String key, System.String defValue) [0x0006c] in <e975227ac8644a30bb0866117325de0d>:0 
  at Plugin.Settings.SettingsImplementation.GetValueOrDefaultCore[T] (Android.Content.ISharedPreferences sharedPreferences, System.String key, T defaultValue, System.String fileName) [0x00179] in C:\projects\settingsplugin\src\Plugin.Settings.Android\Settings.cs:104 
  at Plugin.Settings.SettingsImplementation.GetValueOrDefaultInternal[T] (System.String key, T defaultValue, System.String fileName) [0x0002e] in C:\projects\settingsplugin\src\Plugin.Settings.Android\Settings.cs:46 
  at Plugin.Settings.SettingsImplementation.GetValueOrDefault (System.String key, System.String defaultValue, System.String fileName) [0x00000] in C:\projects\settingsplugin\src\Plugin.Settings.Android\Settings.cs:397 
  at Cas.CaLock.Apps.Helpers.Settings.get_Pin () [0x00000] in C:\Devscope\Projects\CALock\main\src\cli\apps\Cas.CaLock.Apps\Helpers\Settings.cs:52 
  at Cas.CaLock.Apps.App..ctor () [0x00010] in C:\Devscope\Projects\CALock\main\src\cli\apps\Cas.CaLock.Apps\App.xaml.cs:21 
  --- End of managed Java.Lang.ClassCastException stack trace ---
java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String
	at android.app.SharedPreferencesImpl.getString(SharedPreferencesImpl.java:225)
	at md50788623aa0b7eb290a8d8870cdeb2832.MainActivity.n_onCreate(Native Method)
	at md50788623aa0b7eb290a8d8870cdeb2832.MainActivity.onCreate(MainActivity.java:30)
	at android.app.Activity.performCreate(Activity.java:6847)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2649)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2757)
	at android.app.ActivityThread.-wrap12(ActivityThread.java)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1504)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:163)
	at android.app.ActivityThread.main(ActivityThread.java:6237)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
}