Xamarin iOS错误：NullReferenceException

Question

我收到此错误：

System.NullReferenceException: Object reference not set to an instance 
of an object
at MonoTouch.Design.Client.IPhoneDesignerSession  +
 <MaybeConvertToLatestXcode>c__async5.MoveNext () [0x0004c] in 
 /Users/builder/data/lanes/4470/6c2f6737/source/md-
 addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/
 IPhoneDesignerSession.cs:774 
 --- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () 
[0x0000c] in /private/tmp/source-mono-d15-3/bockbuild-d15-
3/profiles/mono-mac-xamarin/build-root/mono-
x64/mcs/class/referencesource/mscorlib/system/runtime/
exceptionservices/exceptionservicescommon.cs:151 
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess 
(System.Threading.Tasks.Task task) [0x00037] in /private/tmp/source-
mono-d15-3/bockbuild-d15-3/profiles/mono-mac-xamarin/build-root/mono-
x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/
TaskAwaiter.cs:187 

我无法查看故事板。

Answer 1

我认为最好将这个问题解决给xamarin支持。

现在，您可以尝试在XCode中打开情节提要。