我已经开始构建Xamarin.IOS应用程序的新教程。 添加单个视图IOS应用程序并尝试打开Main.Storyboard或LaunchScreen.storyboard后，我遇到以下错误
解析本文档中的XML
时出现问题
System.NotSupportedException: Could not parse xml ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object
at MonoTouch.Design.Client.IPhoneDesignerSession.GetCurrentXcodeVersion () [0x00000] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/IPhoneDesignerSession.cs:851
at MonoTouch.Design.Client.IPhoneDesignerSession.get_XcodeVersion () [0x00000] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/IPhoneDesignerSession.cs:160
at MonoTouch.Design.IModelObjectContextExtensions.WithIdProvider (MonoTouch.Design.IModelObjectContext context, MonoTouch.Design.IIdProvider idProvider) [0x0000b] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/IModelObjectContextExtensions.cs:10
at MonoTouch.Design.Parser.ParseElementsAndAttributes (MonoTouch.Design.ParseContext context, System.Object result) [0x0003d] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:278
at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context, System.Object result, Xamarin.Designer.ProxiedException error) [0x000d0] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:370
at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context) [0x00041] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:245
at MonoTouch.Design.Parser.ParseElement (MonoTouch.Design.LayoutGuides layoutGuides, MonoTouch.Design.ParseContext context) [0x0000f] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:1019
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305
--- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00043] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:313
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229
at MonoTouch.Design.Parser.ParseElements (MonoTouch.Design.ParseContext context, System.Object result) [0x000da] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:324
at MonoTouch.Design.Parser.ParseElementsAndAttributes (MonoTouch.Design.ParseContext context, System.Object result) [0x0002d] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:274
at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context, System.Object result, Xamarin.Designer.ProxiedException error) [0x000d0] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:370
at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context) [0x00041] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:245
at MonoTouch.Design.Parser.ParseElement (MonoTouch.Design.ProxiedViewController model, MonoTouch.Design.ParseContext context) [0x000f3] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:751
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305
--- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00043] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:313
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229
at MonoTouch.Design.Parser.ParseElements (MonoTouch.Design.ParseContext context, System.Object result) [0x000da] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:324
at MonoTouch.Design.Parser.ParseElementsAndAttributes (MonoTouch.Design.ParseContext context, System.Object result) [0x0002d] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:274
at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context, System.Object result, Xamarin.Designer.ProxiedException error) [0x000d0] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:370
at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context) [0x00041] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:245
at MonoTouch.Design.Parser.ParseElement (MonoTouch.Design.Scene scene, MonoTouch.Design.ParseContext context) [0x0008b] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:689
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305
--- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00043] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:313
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229
at MonoTouch.Design.Parser.ParseElements (MonoTouch.Design.ParseContext context, System.Object result) [0x000da] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:324
at MonoTouch.Design.Parser.ParseElementsAndAttributes (MonoTouch.Design.ParseContext context, System.Object result) [0x0002d] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:274
at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context, System.Object result, Xamarin.Designer.ProxiedException error) [0x000d0] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:370
at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context) [0x00041] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:245
at MonoTouch.Design.Parser.ParseElement (MonoTouch.Design.Storyboard sb, MonoTouch.Design.ParseContext context) [0x00040] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:884
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305
--- End of inner exception stack trace ---
at MonoTouch.Design.Parser.Parse (MonoTouch.Design.ParseContext context, System.Boolean skipImageGeneration) [0x00021] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:225
at MonoTouch.Design.Parser.Parse (MonoTouch.Design.ParseContext context) [0x00000] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:214
at MonoTouch.Design.Parser.Parse (System.Xml.Linq.XElement xml, MonoTouch.Design.DeviceFamily targetRuntime, MonoTouch.Design.IModelObjectContext modelObjectContext) [0x00014] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:203
at MonoTouch.Design.Client.IPhoneDesignerSession+<LoadXml>d__163.MoveNext () [0x00130] in /Users/builder/data/lanes/5144/b604c37c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/IPhoneDesignerSession.cs:412
我一直在寻找解决这个问题的方法，但没有运气 我找到了以下
但我仍在面对这个问题 有关更多信息，我在Macbook pro上运行Visual Studio社区V7.2.2 build 11和Xcode 9.1（9B55）
PS。我没有在Main.storyboard xml文档中添加或删除任何内容，主要和启动屏幕故事板在Xcode上打开
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11134" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11106" />
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0" />
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="y3c-jy-aDJ" />
<viewControllerLayoutGuide type="bottom" id="wfy-db-euE" />
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="375" height="667" />
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES" />
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB" />
</view>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder" />
</objects>
</scene>
</scenes>
</document>