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I have several of these errors when I build for iOS 10.0 Xamarin Forms app. Have not rebuilt app in about a year. Updated to latest release of xamarin and all of the NuGet projects. PCL builds fine. for the iOS project I am getting duplicate symbol related errors. I am also seeing this one several times:
Duplicate symbol in: /Users/russfustino/Library/Caches/Xamarin/mtbs/builds/JethroTullX.iOS/c36a91d52c95ccf6f555a7b11b5ac829/obj/iPhoneSimulator/Debug/mtouch-cache/libRaygun4iOS.a(crash_report.pb-c.o) (Location related to previous error
Also I have tried both of these on the mtouch arguments and yield same results.
The app needs immediate repair as button images are no longer appearing and the app is crashing is a few places on devices with ios 10.0 and I am hoping a rebuild will fix it, but I can't get that far to test it. Please help.
Microsoft Visual Studio Enterprise 2015
Version 14.0.25431.01 Update 3
Microsoft .NET Framework
Installed Version: Enterprise
Architecture and Modeling Tools 00322-80000-00000-AA141
Microsoft Architecture and Modeling Tools
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LightSwitch for Visual Studio 2015 00322-80000-00000-AA141
Microsoft LightSwitch for Visual Studio 2015
Visual Basic 2015 00322-80000-00000-AA141
Microsoft Visual Basic 2015
Visual C# 2015 00322-80000-00000-AA141
Microsoft Visual C# 2015
Visual C++ 2015 00322-80000-00000-AA141
Microsoft Visual C++ 2015
Windows Phone SDK 8.0 - ENU 00322-80000-00000-AA141
Windows Phone SDK 8.0 - ENU
Application Insights Tools for Visual Studio Package 7.7.00920.6
Application Insights Tools for Visual Studio
ASP.NET and Web Tools 2015.1 14.1.20810.0
ASP.NET and Web Tools 2015.1
ASP.NET Web Frameworks and Tools 2012.2 4.1.41102.0
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ASP.NET Web Frameworks and Tools 2013 5.2.40314.0
For additional information, visit http://www.asp.net/
Azure App Service Tools v2.8.1 14.0.11123.0
Azure App Service Tools v2.8.1
Clang with Microsoft CodeGen 14.0.25516
Clang with Microsoft CodeGen
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Provides ICommandBus, IEventStream and IAsyncManager MEF services for loosely coupled Visual Studio extension components communication and integration.
Common Azure Tools 1.8
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.
KofePackagePackage Extension 1.0
KofePackagePackage Visual Studio Extension Detailed Info
Microsoft .NET Core Tools (Preview 2) 14.1.20810.0
Microsoft .NET Core Tools (Preview 2)
Microsoft Azure Mobile Services Tools 1.4
Microsoft Azure Mobile Services Tools
Microsoft MI-Based Debugger 1.0
Provides support for connecting Visual Studio to MI compatible debuggers
NuGet Package Manager 3.5.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.
Office Developer Tools for Visual Studio 2015 ENU 14.0.23928
Microsoft Office Developer Tools for Visual Studio 2015 ENU
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Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.
SQL Server Data Tools 14.0.60519.0
Microsoft SQL Server Data Tools
TypeScript tools for Visual Studio
Visual C++ for Cross Platform Mobile Development (Android) 14.0.25401.00
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Visual Studio Tools for Apache Cordova Update 10
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This package contains the necessary Visual Studio integration components for Workflow Manager.
Xamarin 126.96.36.1990 (c4382f5)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 188.8.131.52 (0e59c36)
Visual Studio extension to enable development for Xamarin.Android.
Xamarin.iOS 10.0.0.6 (6c3fee4)
Visual Studio extension to enable development for Xamarin.iOS.
Unfortunately it seems that the libRaygun4iOS.a which I presume comes from the raygun4net component contains duplicated symbols and since they have ForceLoad=true in their LinkWith attribute the native linker will try to resolve all symbols on it and _plcrash__crash_report__get_packed_size is duplicated in this library or is conflicting with some other component in your solution.
My suggestion is to raise a bug directly with Raygun4Net team and let them know your issue and temporary disable Raygun4Net in your solution so you can continue developing and testing, once you hear back from Raygun4Net team and probably fix this issue then you can reenable the component.