xamarin.forms - visual studio for mac - 无法预览android

我已经安装了Visual Studio for Mac并启动了一个新的解决方案。我应该能够在Android屏幕上预览（见附件），但无法让它工作。有任何想法吗？ screenshot

以下是详细信息：这是Android Preview中的错误消息：System.NullReferenceException：未将对象引用设置为对象的实例在/Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin中的Xamarin.AndroidDesigner.CodeInteractions.CodeModelBridge.b__31_0（Microsoft.CodeAnalysis.AttributeData a）[0x00000] .AndroidDesigner.CodeInteractions / CodeModelBridge.cs：403 at System.Linq.ImmutableArrayExtensions.Any [T]（System.Collections.Immutable.ImmutableArray 1[T] immutableArray, System.Func 2 [T，TResult]谓词）[0x00025] in＆lt; 36486b016d234fca8cd67892bf29c7b5＆gt ;:0 在/Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin中的Xamarin.AndroidDesigner.CodeInteractions.CodeModelBridge.IsActivityType（Microsoft.CodeAnalysis.INamedTypeSymbol类型）[0x00008] .AndroidDesigner.CodeInteractions / CodeModelBridge.cs：403 在/Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin中的Xamarin.AndroidDesigner.CodeInteractions.CodeModelBridge.GetAndroidEntityForType（Microsoft.CodeAnalysis.INamedTypeSymbol类型）[0x00001] .AndroidDesigner.CodeInteractions / CodeModelBridge.cs：120 在/Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin中的Xamarin.AndroidDesigner.CodeInteractions.CodeModelBridge.b__26_2（Microsoft.CodeAnalysis.INamedTypeSymbol t）[0x00000] .AndroidDesigner.CodeInteractions / CodeModelBridge.cs：311 在System.Linq.Utilities +＆lt;＆gt; c__DisplayClass1_0 1[TSource].<CombinePredicates>b__0 (TSource x) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/external/corefx/src/System.Linq/src/System/Linq/Utilities.cs:58 at System.Linq.Enumerable+WhereSelectEnumerableIterator 2 [TSource，TResult] .ToList（）[0x0001b]在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018- 02 /外部/ bockbuild /建立/单X64 /外部/ corefx / SRC / System.Linq的/ SRC /系统/ LINQ的/ Where.cs：737 at System.Linq.Enumerable.ToList [TSource]（System.Collections.Generic.IEnumerable 1[T] source) [0x0000e] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/external/corefx/src/System.Linq/src/System/Linq/ToCollection.cs:30 at Xamarin.AndroidDesigner.CodeInteractions.CodeModelBridge+<GetCustomComponentsInProject>d__26.MoveNext () [0x00147] in /Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin.AndroidDesigner.CodeInteractions/CodeModelBridge.cs:308 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter 1 [TResult] .GetResult（）[0x00000]在/ Users / builder / jenkins / workspace / build-package-osx中 - 单/ 2018-02 /外部/ bockbuild /建立/单X64 / MCS /类/ referencesource / mscorlib程序/系统/运行/ compilerservices / TaskAwaiter.cs：357 在Xamarin.AndroidDesigner.DesignerProject + d__101.MoveNext（）[0x00025] /Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin.AndroidDesigner/DesignerProject.cs ：300 ---从抛出异常的先前位置开始的堆栈跟踪结束--- 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds / mono-x64 / mcs / class中的System.Runtime.CompilerServices.TaskAwaiter.GetResult（）[0x00000] /referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 在Xamarin.AndroidDesigner.DesignerProject + d__102.MoveNext（）[0x00020] /Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin.AndroidDesigner/DesignerProject.cs ：307 ---从抛出异常的先前位置开始的堆栈跟踪结束--- 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds / mono-x64 / mcs / class中的System.Runtime.CompilerServices.TaskAwaiter.GetResult（）[0x00000] /referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 在Xamarin.AndroidDesigner.DesignerProject + d__54.MoveNext（）[0x0038a] /Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin.AndroidDesigner/DesignerProject.cs ：141 ---从抛出异常的先前位置开始的堆栈跟踪结束--- 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds / mono-x64 / mcs / class中的System.Runtime.CompilerServices.TaskAwaiter.GetResult（）[0x00000] /referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 在Xamarin.AndroidDesigner.AndroidDesignerService + d__57.MoveNext（）[0x0005a] /Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Android/Xamarin.AndroidDesigner/Xamarin.AndroidDesigner/AndroidDesignerService.cs ：464 ---从抛出异常的先前位置开始的堆栈跟踪结束--- 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter 1[TResult].GetResult () [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 at Xamarin.Designer.Forms.XamarinStudioXamlPreviewerView+<InitializeAndroidDesignerProject>d__65.MoveNext () [0x00122] in /Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Forms/Xamarin.FormsPreviewer.MonoDevelop/Xamarin.Designer.Forms/XamarinStudioXamlPreviewerView.cs:542 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-02/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter 1 [TResult] .GetResult（）[0x00000]在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild /建立/单X64 / MCS /类/ referencesource / mscorlib程序/系统/运行/ compilerservices / TaskAwaiter.cs：357 在Xamarin.Designer.Forms.Preview.AndroidXamlRenderer + d__15.MoveNext（）[0x00078] /Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Forms/Xamarin.Designer.Forms.Preview /Android/AndroidXamlRenderer.cs:78 ---从抛出异常的先前位置开始的堆栈跟踪结束--- 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds / mono-x64 / mcs / class中的System.Runtime.CompilerServices.TaskAwaiter.GetResult（）[0x00000] /referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 在Xamarin.Designer.Forms.Preview.AndroidXamlRenderer + d__17.MoveNext（）[0x0004b] in /Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Forms/Xamarin.Designer.Forms.Preview /Android/AndroidXamlRenderer.cs:122 ---从抛出异常的先前位置开始的堆栈跟踪结束--- 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x00037] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds中的System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task任务）[0x00008] /mono-x64/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 在/ Users / builder / jenkins / workspace / build-package-osx-mono / 2018-02 / external / bockbuild / builds / mono-中的System.Runtime.CompilerServices.TaskAwaiter`1 [TResult] .GetResult（）[0x00000] 64 / MCS /类/ referencesource / mscorlib程序/系统/运行/ compilerservices / TaskAwaiter.cs：357 在/Users/vsts/agent/2.133.3/work/1/s/Xamarin.Designer.Forms/Xamarin.Designer.Forms.Preview中的Xamarin.Designer.Forms.Preview.AndroidXamlRenderer + d__18.MoveNext（）[0x000a0] /Android/AndroidXamlRenderer.cs:197

visual studio for mac - 无法预览android

1 个答案: