MGCB Crashing

I am trying to convert a Content pipeline extension to 3.8 the extension compiles but when I go to add the reference to mgcb It crashes when I reload I get a crash report as follows System.ArgumentException: Could not convert from string({R:0 G:0 B:0 A:0}) to Color, expected format is ‘r,g,b,a’
at Microsoft.Xna.Framework.Content.Pipeline.Builder.Convertors.StringToColorConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\MonoGame.Framework.Content.Pipeline\Builder\Convertors\StringToColorConverter.cs:line 54
at MonoGame.Tools.Pipeline.ContentItem.ResolveTypes() in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Common\ContentItem.cs:line 176
at MonoGame.Tools.Pipeline.PipelineController.ResolveTypes() in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Common\PipelineController.cs:line 923
at MonoGame.Tools.Pipeline.PipelineController.OnReferencesModified() in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Common\PipelineController.cs:line 146
at MonoGame.Tools.Pipeline.CellRefs.Edit(PixelLayout control) in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Controls\PropertyCells\CellRefs.cs:line 42
at MonoGame.Tools.Pipeline.PropertyGridTable.<Drawable_MouseUp>b__29_0() in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Controls\PropertyGridTable.cs:line 241
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
— End of stack trace from previous location where exception was thrown —
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.Run()
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at Eto.Wpf.Forms.ApplicationHandler.Run()
at Eto.Forms.Application.Run(Form mainForm)
at MonoGame.Tools.Pipeline.Program.CommandLineInterface.Run(InvocationContext context, String project) in C:\BuildAgents\MonoGameWin1\work\f7381a85a626990\Tools\MonoGame.Content.Builder.Editor\Program.cs:line 107

Fixed it turns out it was an error in an x file having a rougue character