Xamarin Android app crash in Release mode (Parse.Android SDK)

Question

I am developing app which uses Parse Android SDK. App is working properly in debug mode but when i compile it on release mode i get following errors. Error occur when parse query is executed. Not when i initialize parse.

[MonoDroid] UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
[MonoDroid]   at Parse.PlatformHooks+<RequestAsync>d__19.MoveNext () [0x00000] in <filename unknown>:0 
[MonoDroid] --- End of stack trace from previous location where exception was thrown ---
[MonoDroid]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 
[MonoDroid]   at Parse.Internal.InternalExtensions+<>c__DisplayClass7`1[System.Tuple`2[System.Net.HttpStatusCode,System.Collections.Generic.IDictionary`2[System.String,System.Object]]].<OnSuccess>b__6 (System.Threading.Tasks.Task t) [0x00000] in <filename unknown>:0 
[MonoDroid]   at System.Threading.Tasks.TaskActionInvoker+FuncTaskInvoke`1[System.Threading.Tasks.Task`1[System.Tuple`2[System.Net.HttpStatusCode,System.Collections.Generic.IDictionary`2[System.String,System.Object]]]].Invoke (System.Threading.Tasks.Task owner, System.Object state, System.Threading.Tasks.Task context) [0x00000] in <filename unknown>:0 
[MonoDroid]   at System.Threading.Tasks.Task.InnerInvoke () [0x00000] in <filename unknown>:0 
[MonoDroid]   at System.Threading.Tasks.Task.ThreadStart () [0x00000] in <filename unknown>:0 
[MonoDroid] --- End of stack trace from previous location where exception was thrown ---
[MonoDroid]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 
[MonoDroid]   at Parse.Internal.InternalExtensions+<>c__DisplayClass7`1[System.Collections.Generic.IEnumerable`1[Parse.ParseObject]].<OnSuccess>b__6 (System.Threading.Tasks.Task t) [0x00000] in <filename unknown>:0 
[MonoDroid]   at System.Threading.Tasks.TaskActionInvoker+FuncTaskInvoke`1[System.Threading.Tasks.Task`1[System.Collections.Generic.IEnumerable`1[Parse.ParseObject]]].Invoke (System.Threading.Tasks.Task owner, System.Object state, System.Threading.Tasks.Task context) [0x00000] in <filename unknown>:0 
[MonoDroid]   at System.Threading.Tasks.Task.InnerInvoke () [0x00000] in <filename unknown>:0 
[MonoDroid]   at System.Threading.Tasks.Task.ThreadStart () [0x00000] in <filename unknown>:0 
[MonoDroid] --- End of stack trace from previous location where exception was thrown ---
[MonoDroid]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 
[MonoDroid]   at System.Runtime.CompilerServices.TaskAwaiter`1[System.Collections.Generic.IEnumerable`1[Parse.ParseObject]].GetResult () [0x00000] in <filename unknown>:0 
[MonoDroid]   at ParseDAL.ParseCaller+<Init>c__async0.MoveNext () [0x00000] in <filename unknown>:0 
[mono] 
[mono] Unhandled Exception:
[mono] System.NullReferenceException: Object reference not set to an instance of an object
[mono]   at Parse.PlatformHooks+<RequestAsync>d__19.MoveNext () [0x00000] in <filename unknown>:0 
[mono] --- End of stack trace from previous location where exception was thrown ---
[mono]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 
[mono]   at Parse.Internal.InternalExtensions+<>c__DisplayClass7`1[System.Tuple`2[System.Net.HttpStatusCode,System.Collections.Generic.IDictionary`2[System.String,System.Object]]].<OnSuccess>b__6 (System.Threading.Tasks.Task t) [0x00000] in <filename unknown>:0 
[mono]   at System.Threading.Tasks.TaskActionInvoker+FuncTaskInvoke`1[System.Threading.Tasks.Task`1[System.Tuple`2[System.Net.HttpStatusCode,System.Collections.Generic.IDictionary`2[System.String,System.Object]]]].Invoke (System.Threading.Tasks.Task owner, System.Object state, System.Threading.Tasks.Task context) [0x00000] in <filename unknown>:0 
[mono]   at System.Threading.Tasks.Task.InnerInvoke 
[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
[mono-rt]   at Parse.PlatformHooks+<RequestAsync>d__19.MoveNext () [0x00000] in <filename unknown>:0 
[mono-rt] --- End of stack trace from previous location where exception was thrown ---
[mono-rt]   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 
[mono-rt]   at Parse.Internal.InternalExtensions+<>c__DisplayClass7`1[System.Tuple`2[System.Net.HttpStatusCode,System.Collections.Generic.IDictionary`2[System.String,System.Object]]].<OnSuccess>b__6 (System.Threading.Tasks.Task t) [0x00000] in <filename unknown>:0 
[mono-rt]   at System.Threading.Tasks.TaskActionInvoker+FuncTaskInvoke`1[System.Threading.Tasks.Task`1[System.Tuple`2[System.Net.HttpStatusCode,System.Collections.Generic.IDictionary`2[System.String,System.Object]]]].Invoke (System.Threading.Tasks.Task owner, System.Object state, System.Threading.Tasks.Task context) [0x00000] in <filename unknown>:0 
[mono-rt]   at System.Threading.Tasks.Task

Following is the code:

ParseClient.Initialize("App Id", "Dot Net Key");
var userQuery = ParseObject.GetQuery ("Table Name");
var userData = await userQuery.FindAsync ();
foreach (var ud in userData) {
    Console.WriteLine ("UD " + ud.Get<string>(Constants.COL_USER_NAME));
}

I tried with all linker option "Dont Link", "Link All Assemblies", "Link SDK assemblies". But app is still crashing.

Answer 1

This exception occur because of network issue not because of debug/release build. In debug mode INTERNET permission is automatically added in manifest file, but not in release mode. So add this permission in manifest file.

<uses-permission android:name="android.permission.INTERNET" />

after this exception will not occur in release mode.

We still need to check that network is available or not before sending request to parse.