Xamarin iOS error: Can not resolve reference

12
votes

If I set up a Xamarin.Forms Solution in VS 2013 and try to run the iOS Version, it fails because of the following error:

Error 2 Can not resolve reference: /Users/Koray/Library/Caches/Xamarin/mtbs/builds/WalkiOS/aae389efbebffd5cd3625dcf99aad02c/C:/Program Files (x86)/Reference Assemblies/Microsoft/Framework/Xamarin.iOS/v1.0/Facades/System.Collections.Concurrent.dll Walk.iOS

The Xamarin Build Host for Visual Studio is set up and a few weeks ago it worked fine. I can't find anything to fix the error.

2
c#iosxamarinxamarin.ios
i think its because it cant find the path of you reference. you may have to manually reference it again. - M.kazem Akhgary
@M.kazem Akhgary I tried it it does not work either. Same error... - Ybrin

2 Answers

17
votes

The solution is to update Xamarin on both machines to the same version. It should work fine if you do this.

1
votes

This can happen if you include a library that's not part of Xamarin.iOS. For example, when you Alt-Enter with ReSharper and it auto-adds a reference it thinks will work, when actually, there's no iOS equivalent of it. This happened to me when I had ReSharper add System.Web. The error looked like System.EnterpriseServices.Wrapper, but the actual error was a non-Mono/non-iOS library being referenced by my project. Unfortunately, the error message is effectively wrong. I hope that helps!

Ybrin's answer is also true. I came across this SO article looking for a different answer, and ended up figuring out this alternative answer.