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After updating to Xamarin 4 (customer's version info in private comment below), customer got the following error on build:
>/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/iOS/Xamarin.iOS.Common.targets: Error: Error executing task DetectSdkLocations: Unknown TargetFrameworkIdentifier: .NETFramework (iECDDatasource)
I found this internal bug report that _may_ be related:
I do not have steps to reproduce as no test project was provided.
Further info from customer is in private comment below.
This is most likely something wrong with the customer's project file (i.e. a dup of bug #35890).
Would it be possible to get access to the project that's failing to build (and a diagnostic build log)?
Customer was able to figure this out.
From the customer:
"In the project properties there is a property called “iOS SDK Version.” After the Xamarin install it was set to “iOS 9.0 (Not Installed)”
Setting the property to iOS 9.1 fixed the issue. In my mind if there is only one SDK present then it should automatically be set to iOS 9.1 after the Xamarin installation. Please add this to your next build."
Setting status to RESOLVED INVALID
However my understanding is that if a SDK Version is set explicitly, it will not (and perhaps should not) be changed with an update. If the compile SDK is set to "Default" in the project options then the newly updated SDK from XCode will be used.