CODEWITHSUNDEEP
c#xamarinxamarin.forms
Adam
Adam

Reputation: 856

The "XamlCTask" task failed unexpectedly. What to do?

I am getting this error:

The "XamlCTask" task failed unexpectedly. System.ArgumentException: An item with the same key has already been added.

Server stack trace: 
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Xamarin.Forms.Xaml.XamlParser.ParseXamlElementFor(IElementNode node, XmlReader reader)
   at Xamarin.Forms.Xaml.XamlParser.ReadNode(XmlReader reader, Boolean nested)
   at Xamarin.Forms.Xaml.XamlParser.ParseXamlElementFor(IElementNode node, XmlReader reader)
   at Xamarin.Forms.Xaml.XamlParser.ReadNode(XmlReader reader, Boolean nested)
   at Xamarin.Forms.Xaml.XamlParser.ParseXamlElementFor(IElementNode node, XmlReader reader)
   at Xamarin.Forms.Xaml.XamlParser.ReadNode(XmlReader reader, Boolean nested)
   at Xamarin.Forms.Xaml.XamlParser.ParseXamlElementFor(IElementNode node, XmlReader reader)
   at Xamarin.Forms.Xaml.XamlParser.ParseXaml(RootNode rootNode, XmlReader reader)
   at Xamarin.Forms.Build.Tasks.XamlTask.ParseXaml(Stream stream, TypeReference typeReference)
   at Xamarin.Forms.Build.Tasks.XamlCTask.Execute(IList`1& thrownExceptions)
   at Xamarin.Forms.Build.Tasks.XamlTask.Execute()
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at Microsoft.Build.Framework.ITask.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()

I know that it is saying that the item is duplicated but I scanned whole project with Total Commander and I didn't find any duplicated file.

Upvotes: 1

Views: 1270

Answers (3)

BladeMaster
BladeMaster

Reputation: 330

Usually happens when there is error in compiling of your xaml code. Check the code recently added.

Upvotes: 0

Nick Kovalsky
Nick Kovalsky

Reputation: 6462

You might just have an error in your XAML page. "An item with the same key has already been added." might be some duplicate property.

Upvotes: 2

tequila slammer
tequila slammer

Reputation: 2879

Consolidate your nuGet-packages and make sure all Xamarin.Forms referencing projects uses the same Xamarin.Forms version. After that empty the packages folder, clean and rebuild your solution.

Upvotes: 0

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