error : Error initializing task XamlG: Not registered task XamlG

Question

I am developing a Xamarin Forms (PCL) application for IOS and Android Platform.

My Xamarin Studio version is 5.5.4 (Build 15). I am on stable channel.

My Xamarin Forms dll version is 1.3.0.6292.

I have also added a Xamarin Forms Labs reference from NuGet, v1.2.0.

Since yesterday, whenever i am building the solution, i get following error:

error : Error initializing task XamlG: Not registered task XamlG.

Any possible resolution for this error? I have tried clean and build multiple time. Even deleted the entire source code and redownloaded everything from source control but same error.

Answer 1

This error can occur if you have upgraded from an older version of Xamarin.Forms to a newer version. The underlying problem is that the wrong Xamarin.Forms.Build.Tasks.dll is being loaded compared with the one that the custo MSBuild Xamarin.Forms.targets file is expecting.

There is a bug in Xamarin Studio where the old build Xamarin.Forms build tasks are still used after the NuGet package has been upgraded. You can workaround this by closing and re-opening the solution.

However you say you have deleted the source code and downloaded everything again so it sounds like you have a different problem. It may be that your project is trying to use two different versions of Xamarin.Forms at the same time. I would look at your project files (.csproj) in a text editor and make sure they are all using one version of Xamarin.Forms. Check that they are all referencing a single version of Xamarin.Forms.targets and it is the same version.