Monogame Pipeine error

When I try to add content to the Monogame pipeline I get this error:
Log Name: Application
Source: Application Error
Date: 2/26/18 1:30:17 PM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: JOHNDA00
Description:
Faulting application name: Pipeline.exe, version: 3.6.0.1625, time stamp: 0x58b6e343
Faulting module name: KERNELBASE.dll, version: 10.0.15063.726, time stamp: 0x1a9bbe0b
Exception code: 0xe0434352
Fault offset: 0x0000000000069d98
Faulting process id: 0x1f9c
Faulting application start time: 0x01d3af2fb228e0bd
Faulting application path: C:\Program Files (x86)\MSBuild\MonoGame\v3.0\Tools\Pipeline.exe
Faulting module path: C:\Windows\System32\KERNELBASE.dll
Report Id: 68afb141-843b-4544-b864-9f062319afe1
Faulting package full name:
Faulting package-relative application ID:
Event Xml:



1000
2
100
0x80000000000000

6830
Application
JOHNDA00



Pipeline.exe
3.6.0.1625
58b6e343
KERNELBASE.dll
10.0.15063.726
1a9bbe0b
e0434352
0000000000069d98
1f9c
01d3af2fb228e0bd
C:\Program Files (x86)\MSBuild\MonoGame\v3.0\Tools\Pipeline.exe
C:\Windows\System32\KERNELBASE.dll
68afb141-843b-4544-b864-9f062319afe1





and also this:
Log Name: Application
Source: .NET Runtime
Date: 2/26/18 1:30:17 PM
Event ID: 1026
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: JOHNDA00
Description:
Application: Pipeline.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.UriFormatException
at System.Uri.CreateThis(System.String, Boolean, System.UriKind)
at MonoGame.Tools.Pipeline.MainWindow.ChooseContentFile(System.String, System.Collections.Generic.List1<System.String> ByRef) at MonoGame.Tools.Pipeline.PipelineController.Include() at Eto.Forms.Command.OnExecuted(System.EventArgs) at Eto.Forms.Command.System.Windows.Input.ICommand.Execute(System.Object) at Eto.Forms.MenuItem.OnClick(System.EventArgs) at Eto.Platform.Invoke(System.Action) at Eto.Wpf.Forms.Menu.MenuItemHandler3[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].OnClick()
at System.Windows.EventRoute.InvokeHandlersImpl(System.Object, System.Windows.RoutedEventArgs, Boolean)
at System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject, System.Windows.RoutedEventArgs)
at System.Windows.Controls.MenuItem.InvokeClickAfterRender(System.Object)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at MS.Internal.CulturePreservingExecutionContext.Run(MS.Internal.CulturePreservingExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef)
at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
at System.Windows.Application.RunDispatcher(System.Object)
at System.Windows.Application.RunInternal(System.Windows.Window)
at MonoGame.Tools.Pipeline.Program.Main(System.String[])

Event Xml:



1026
2
0
0x80000000000000

6829
Application
JOHNDA00



Application: Pipeline.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.UriFormatException
at System.Uri.CreateThis(System.String, Boolean, System.UriKind)
at MonoGame.Tools.Pipeline.MainWindow.ChooseContentFile(System.String, System.Collections.Generic.List1&lt;System.String&gt; ByRef) at MonoGame.Tools.Pipeline.PipelineController.Include() at Eto.Forms.Command.OnExecuted(System.EventArgs) at Eto.Forms.Command.System.Windows.Input.ICommand.Execute(System.Object) at Eto.Forms.MenuItem.OnClick(System.EventArgs) at Eto.Platform.Invoke(System.Action) at Eto.Wpf.Forms.Menu.MenuItemHandler3[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].OnClick()
at System.Windows.EventRoute.InvokeHandlersImpl(System.Object, System.Windows.RoutedEventArgs, Boolean)
at System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject, System.Windows.RoutedEventArgs)
at System.Windows.Controls.MenuItem.InvokeClickAfterRender(System.Object)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at MS.Internal.CulturePreservingExecutionContext.Run(MS.Internal.CulturePreservingExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef)
at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
at System.Windows.Application.RunDispatcher(System.Object)
at System.Windows.Application.RunInternal(System.Windows.Window)
at MonoGame.Tools.Pipeline.Program.Main(System.String[])