Unable to find the file 'OxyPlot.dll' on OS X

I have mono 3.8, I am running F# interactive from within emacs on OS X mavericks.

I downloaded FSharp.Charting.Gtk.0.90.7 from nuget. I put it in ~/Desktop/packages/. I have a script containing the following at ~/Desktop/test.fsx:
# load "packages/FSharp.Charting.Gtk.0.90.7/FSharp.Charting.Gtk.fsx"

open FSharp.Charting
Chart.Line [ for x in 0 .. 10 -> x, x*x ]

Trying to run the three lines above gives the following error:

"> [Loading /Users/james/Desktop/packages/FSharp.Charting.Gtk.0.90.7/FSharp.Charting.Gtk.fsx]

/Users/james/Desktop/packages/FSharp.Charting.Gtk.0.90.7/FSharp.Charting.Gtk.fsx(28,1): warning FS0211: The search directory '/usr/lib/mono/gtk-sharp-2.0' could not be found
2014-09-05 12:49:13.471 mono[7211:d07] **\* WARNING: Method userSpaceScaleFactor in class NSView is deprecated on 10.7 and later. It should not be used in new applications. Use convertRectToBacking: instead.

namespace FSI_0002.FSharp.Charting
val verifyMac : unit -> bool
val isMac : bool
module FsiAutoShow = begin
end

/Users/james/Desktop/stdin(0,1): error FS0078: Unable to find the file 'OxyPlot.dll' in any of
/Library/Frameworks/Mono.framework/Versions/3.8.0/lib/mono/4.5
/Library/Frameworks/Mono.framework/Versions/Current/lib/mono/gtk-sharp-2.0
/Users/james/Desktop/packages/FSharp.Charting.Gtk.0.90.7/.
/Users/james/Desktop/
/Library/Frameworks/Mono.framework/Versions/3.8.0/lib/mono/4.0/
Stopped due to error"

I created symbolic links to OxyPlot.dll and OxyPlot.GtkSharp.dll in /Users/james/Desktop/packages/FSharp.Charting.Gtk.0.90.7/. I then get the following error and and a something called mono-sgen appeared in my dock:

"> [Loading /Users/james/Desktop/packages/FSharp.Charting.Gtk.0.90.7/FSharp.Charting.Gtk.fsx]

/Users/james/Desktop/packages/FSharp.Charting.Gtk.0.90.7/FSharp.Charting.Gtk.fsx(28,1): warning FS0211: The search directory '/usr/lib/mono/gtk-sharp-2.0' could not be found
2014-09-05 14:24:36.773 mono[7551:d07] **\* WARNING: Method userSpaceScaleFactor in class NSView is deprecated on 10.7 and later. It should not be used in new applications. Use convertRectToBacking: instead.

namespace FSI_0002.FSharp.Charting
val verifyMac : unit -> bool
val isMac : bool
module FsiAutoShow = begin
end

Binding session to '/Users/james/Desktop/packages/FSharp.Charting.Gtk.0.90.7/./OxyPlot.dll'...
Binding session to '/Users/james/Desktop/packages/FSharp.Charting.Gtk.0.90.7/./OxyPlot.GtkSharp.dll'...

val it : FSharp.Charting.ChartTypes.GenericChart =
Error: An exception was thrown by the type initializer for Gtk.Widget

> "