Failed to run serialization weaver - WSA build player error in Unity 2017

In the past I have built a WSA project with Unity 2017.3.1 just fine.However, after several months, I went back to the project and now I'm getting a bizarre error and won't build a VS project. I even tried in 2017.4.17, but still the same error. Can anybody help please?

UnityException: Failed to run serialization weaver with command "Temp\StagingArea\Data\Managed\GLTFSerializationUWP.dll" "-pdb" "-verbose" "-unity-engine=Temp\StagingArea\Data\Managed\UnityEngine.CoreModule.dll" "Temp\StagingArea\TempSerializationWeaver" "-lock=UWP\project.lock.json" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\UnionMetadata\10.0.16299.0\Facade" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Calls.CallsVoipContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.SocialInfo.SocialInfoContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.StartupTaskContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Custom.CustomDeviceContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.DevicesLowLevelContract\3.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Printers.PrintersContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.SmartCards.SmartCardBackgroundTriggerContract\3.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.SmartCards.SmartCardEmulatorContract\5.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Foundation.FoundationContract\3.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Foundation.UniversalApiContract\5.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Gaming.XboxLive.StorageApiContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Graphics.Printing3D.Printing3DContract\4.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Networking.Connectivity.WwanContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Services.Store.StoreContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Services.TargetedContent.TargetedContentContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.System.Profile.ProfileHardwareTokenContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.System.Profile.ProfileSharedModeContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.UI.ViewManagement.ViewManagementViewScalingContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Activation.ActivatedEventsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Activation.ActivationCameraSettingsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Activation.ContactActivatedEventsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Activation.WebUISearchActivatedEventsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Background.BackgroundAlarmApplicationContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Calls.Background.CallsBackgroundContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Calls.LockScreenCallContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.FullTrustAppContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Preview.InkWorkspace.PreviewInkWorkspaceContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Preview.Notes.PreviewNotesContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Resources.Management.ResourceIndexerContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Search.Core.SearchCoreContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Search.SearchContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Wallet.WalletContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Portable.PortableDeviceContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Printers.Extensions.ExtensionsContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Scanners.ScannerDeviceContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Sms.LegacySmsApiContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Gaming.Input.GamingInputPreviewContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Gaming.Preview.GamesEnumerationContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Gaming.UI.GameChatOverlayContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Gaming.UI.GamingUIProviderContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Globalization.GlobalizationJapanesePhoneticAnalyzerContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Management.Deployment.Preview.DeploymentPreviewContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Management.Workplace.WorkplaceSettingsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.AppBroadcasting.AppBroadcastingContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.AppRecording.AppRecordingContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.Capture.AppBroadcastContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.Capture.AppCaptureContract\4.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.Capture.AppCaptureMetadataContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.Capture.CameraCaptureUIContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.Capture.GameBarContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.Devices.CallControlContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.MediaControlContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.Playlists.PlaylistsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Media.Protection.ProtectionRenewalContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Networking.NetworkOperators.LegacyNetworkOperatorsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Networking.Sockets.ControlChannelTriggerContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Networking.XboxLive.XboxLiveSecureSocketsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Perception.Automation.Core.PerceptionAutomationCoreContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Security.EnterpriseData.EnterpriseDataContract\5.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Security.ExchangeActiveSyncProvisioning.EasContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Services.Maps.GuidanceContract\3.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Services.Maps.LocalSearchContract\4.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Storage.Provider.CloudFilesContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.System.Profile.SystemManufacturers.SystemManufacturersContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.System.Profile.ProfileRetailInfoContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.System.UserProfile.UserProfileContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.System.UserProfile.UserProfileLockScreenContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.UI.ApplicationSettings.ApplicationsSettingsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.UI.Core.AnimationMetrics.AnimationMetricsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.UI.Core.CoreWindowDialogsContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.UI.Xaml.Hosting.HostingContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Web.Http.Diagnostics.HttpDiagnosticsContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.System.SystemManagementContract\4.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Calls.CallsPhoneContract\3.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.CommunicationBlocking.CommunicationBlockingContract\2.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Embedded.DeviceLockdown.DeviceLockdownContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Networking.NetworkOperators.NetworkOperatorsFdnContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Phone.PhoneContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Phone.StartScreen.DualSimTileContract\1.0.0.0" "-additionalAssemblyPath=C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.UI.WebUI.Core.WebUICommandBarContract\1.0.0.0" "-additionalAssemblyPath=Temp\StagingArea\Data\Managed".
Symbols will be read from Temp\StagingArea\Data\Managed\UnityEngine.CoreModule.pdb
Symbols will be read from Temp\StagingArea\Data\Managed\GLTFSerializationUWP.pdb
Weaving assembly C:\Users\icevr\git\geisha-2017\IceRealityClient\Temp\StagingArea\Data\Managed\GLTFSerializationUWP.dll
System.InvalidOperationException: Operation is not valid due to the current state of the object.
at Mono.Cecil.ModuleDefinition.ReadSymbols(ISymbolReader reader)
at Mono.Cecil.ModuleReader.ReadSymbols(ModuleDefinition module, ReaderParameters parameters)
at Mono.Cecil.ModuleReader.CreateModule(Image image, ReaderParameters parameters)
at Mono.Cecil.ModuleDefinition.ReadModule(String fileName, ReaderParameters parameters)
at usw.Weaver.WeaveAssembly(String assemblyPath, AssemblyDefinition unityEngineAssemblyDefinition, ReaderParameters readerParameters) in C:\buildslave\unity\build\Tools\SerializationWeaver\sw\Weaver.cs:line 95
at usw.Weaver.Weave() in C:\buildslave\unity\build\Tools\SerializationWeaver\sw\Weaver.cs:line 50
at usw.Program.RunProgram(ConversionOptions options) in C:\buildslave\unity\build\Tools\SerializationWeaver\sw\Program.cs:line 33
at usw.Program.Main(String[] args) in C:\buildslave\unity\build\Tools\SerializationWeaver\sw\Program.cs:line 14

PostProcessWinRT.RunSerializationWeaver () (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessWinRT.cs:810)
PostProcessWinRT.Process () (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessWinRT.cs:203)
UnityEditor.WSA.BuildPostprocessor.DoPostProcess (BuildPostProcessArgs args) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/ExtensionModule.cs:117)
UnityEditor.WSA.BuildPostprocessor.PostProcess (BuildPostProcessArgs args) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/ExtensionModule.cs:124)
UnityEditor.BuildPipeline:BuildPlayer(BuildPlayerOptions)
BuildHelper:buildForWMR(Boolean) (at Assets/Editor/BuildHelper.cs:424)
BuildHelper:OnGUI() (at Assets/Editor/BuildHelper.cs:357)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)