Cannot find file error for iOS

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System.IO.FileNotFoundException: Could not find file "/Users/..../Library/Caches/Xamarin/mtbs/builds/....iOS/bce8e448d6683b6b27c8810f8a6f5018/obj/iPhoneSimulator/Gorilla/optimized/filenamehere.png"
File name: '/Users/..../Library/Caches/Xamarin/mtbs/builds/....iOS/bce8e448d6683b6b27c8810f8a6f5018/obj/iPhoneSimulator/Gorilla/optimized/filenamehere.png'

at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x00259] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-02/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/FileStream.cs:274
at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.IO.FileOptions options) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-02/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/FileStream.cs:106
at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int,System.IO.FileOptions)
at System.IO.FileSystem.CopyFile (System.String sourceFullPath, System.String destFullPath, System.Boolean overwrite) [0x0001b] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-02/external/bockbuild/builds/mono-x64/external/corefx/src/System.IO.FileSystem/src/System/IO/FileSystem.Unix.cs:25
at System.IO.File.Copy (System.String sourceFileName, System.String destFileName, System.Boolean overwrite) [0x00056] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-02/external/bockbuild/builds/mono-x64/external/corefx/src/System.IO.FileSystem/src/System/IO/File.cs:74
at Xamarin.MacDev.Tasks.SmartCopyTaskBase.CopyFile (System.String source, System.String target, System.String targetItemSpec) [0x0002d] in <40511172e14e48d3bd6c345b45f8f142>:0
at Xamarin.MacDev.Tasks.SmartCopyTaskBase.Execute () [0x000b6] in <40511172e14e48d3bd6c345b45f8f142>:0 ....iOS C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets 498

This is when trying to deploy. It happened all of a sudden. Items of note:

1. the file is present in the project
2. the file is present here C:\Dev<path>\Main<path>....iOS\obj\iPhoneSimulator\Gorilla\optimized
3. I've tried the following:

• clean
• rebuild
• restart vs
• delete object/bin