ALL other solution packages are up-to-date, I am using the latest stable release of Xamarin Studio for Mac (7.1 (build 1297)) running Mac OS X 10.12.6. Further below please find some ADDITIONAL STEPS TAKEN and some ADDITIONAL INFORMATION.
Just upgraded my solution from sr2 to the latest Xamarin Forms package sr5. Now getting the following build errors while building PCL library:
/Src/MYFOLDER/packages/Xamarin.Forms.2.3.4.267/build/portable-win+net45+wp80+win81+wpa81+MonoAndroid10+Xamarin.iOS10+xamarinmac20/Xamarin.Forms.targets(3,3): Error MSB4077: The "Xamarin.Forms.Build.Tasks.XamlCTask" task has been marked with the attribute LoadInSeparateAppDomain, but does not derive from MarshalByRefObject. Check that the task derives from MarshalByRefObject or AppDomainIsolatedTask. (MSB4077) (Utilities.Api)
/Src/MYFOLDER/packages/Xamarin.Forms.2.3.4.267/build/portable-win+net45+wp80+win81+wpa81+MonoAndroid10+Xamarin.iOS10+xamarinmac20/Xamarin.Forms.targets(3,3): Error MSB4060: The "XamlCTask" task has been declared or used incorrectly, or failed during construction. Check the spelling of the task name and the assembly name. (MSB4060) (Utilities.Api)
ADDITIONAL STEPS TAKEN
Cleaned entire solution
ADDITIONAAL INFORMATION:
=== Visual Studio Enterprise 2017 for Mac ===
Version 7.1 (build 1297)
Installation UUID: 034ea3f9-f985-4e7e-89e7-b970f1896033
Runtime:
Mono 5.2.0.215 (d15-3/da80840) (64-bit)
GTK+ 2.24.23 (Raleigh theme)
Package version: 502000215
=== NuGet ===
Version: 4.3.0.2418
=== .NET Core ===
Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
1.1.1
1.0.4
SDK: /usr/local/share/dotnet/sdk/1.0.3/Sdks
SDK Version: 1.0.3
MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/5.2.0/lib/mono/msbuild/15.0/bin/Sdks
=== Xamarin.Profiler ===
Version: 1.5.5
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler
=== Apple Developer Tools ===
Xcode 8.3.3 (12175.1)
Build 8E3004b
=== Xamarin.iOS ===
Version: 10.12.0.18 (Visual Studio Enterprise)
Hash: 4a279c9a
Branch: d15-3
Build date: 2017-08-02 12:38:11-0400
=== Xamarin.Mac ===
Version: 3.6.0.17 (Visual Studio Enterprise)
=== Xamarin.Android ===
Version: 7.4.0.19 (Visual Studio Enterprise)
Android SDK: /Users/kenwenyon/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
4.0.3 (API level 15)
4.1 (API level 16)
4.2 (API level 17)
4.3 (API level 18)
4.4 (API level 19)
4.4.87 (API level 20)
5.0 (API level 21)
5.1 (API level 22)
6.0 (API level 23)
7.0 (API level 24)
7.1 (API level 25)
SDK Tools Version: 25.2.5
SDK Platform Tools Version: 25.0.4
SDK Build Tools Version: 26.0.0
Java SDK: /usr
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL
=== Xamarin Inspector ===
Version: 1.2.2
Hash: b71b035
Branch: d15-1
Build date: Fri, 21 Apr 2017 17:57:12 GMT
=== Build Information ===
Release ID: 701001297
Git revision: 9c5299666538b2f8baf501418a5c064d784d64da
Build date: 2017-08-07 11:29:35-04
Xamarin addins: 3bb0c32a14f1b7e368bf5ac53a84c3581c019391
Build lane: monodevelop-lion-d15-3
=== Operating System ===
Mac OS X 10.12.6
Darwin 16.7.0 Darwin Kernel Version 16.7.0
Thu Jun 15 17:36:27 PDT 2017
root:xnu-3789.70.16~2/RELEASE_X86_64 x86_64