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VisualStudio.iOS update check fails

Hello!

Every time I try to update components through VS (Tools/Xamarin/iOS) I'm getting the following error:

Mono.IOS.VisualStudio.MonoTouchPackage Error: 0 : Background task error
System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. ---> System.MissingMethodException: Method not found: 'System.Threading.Tasks.Task1<System.Collections.Generic.List1<Mono.VisualStudio.Extension.Update>> Mono.VisualStudio.Extension.UpdateClient.CheckForUpdates(System.Guid, Mono.VisualStudio.Extension.UpdateLevel, System.String, System.String)'.
at Mono.IOS.VisualStudio.Utilities.UpdaterTasks.CheckForUpdates()
at Mono.IOS.VisualStudio.Utilities.UpdaterTasks.b__0(Task1 license_task) at System.Threading.Tasks.ContinuationTaskFromResultTask1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.MissingMethodException: Method not found: 'System.Threading.Tasks.Task1<System.Collections.Generic.List1<Mono.VisualStudio.Extension.Update>> Mono.VisualStudio.Extension.UpdateClient.CheckForUpdates(System.Guid, Mono.VisualStudio.Extension.UpdateLevel, System.String, System.String)'.
at Mono.IOS.VisualStudio.Utilities.UpdaterTasks.CheckForUpdates()
at Mono.IOS.VisualStudio.Utilities.UpdaterTasks.b__0(Task1 license_task) at System.Threading.Tasks.ContinuationTaskFromResultTask1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()<---

What could be wrong. I couldn't switch to Alpha channel because of this bug.

TIA!

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