title: Can't open script file in Mono Develop after update unity
body: <p>I update my Unity from 5.2 to 5.6, this is success. But after update, i can't open file script. This is Error </p>
  
  <blockquote>
    <p>The file '/Users/vietbac/Desktop/New Unity Project 1/Assets/NewBehaviourScript.cs' could not be opened. Error while loading style :Default</p>
    
    <p>System.IO.IOException: Error while loading style :Default --->
    System.TypeInitializationException: An exception was thrown by the
    type initializer for System.Drawing.KnownColors --->
    System.TypeInitializationException: An exception was thrown by the
    type initializer for System.Drawing.GDIPlus --->
    System.DllNotFoundException:
    /Applications/Unity/MonoDevelop.app/Contents/MacOS/../Frameworks/Mono.framework/Versions/2.10.12/lib/libgdiplus.dylib
    at (wrapper managed-to-native) System.Drawing.GDIPlus:GdiplusStartup
    (ulong&amp;,System.Drawing.GdiplusStartupInput&amp;,System.Drawing.GdiplusStartupOutput&amp;)
    at System.Drawing.GDIPlus..cctor () [0x00000] in :0 
    --- End of inner exception stack trace ---   at System.Drawing.KnownColors..cctor () [0x00000] in :0
    --- End of inner exception stack trace ---   at System.Drawing.ColorConverter.StaticConvertFromString
    (ITypeDescriptorContext context, System.String s,
    System.Globalization.CultureInfo culture) [0x00000] in :0    at System.Drawing.ColorConverter.ConvertFrom
    (ITypeDescriptorContext context, System.Globalization.CultureInfo
    culture, System.Object value) [0x00000] in :0    at
    System.ComponentModel.TypeConverter.ConvertFrom (System.Object o)
    [0x00000] in :0    at
    System.ComponentModel.TypeConverter.ConvertFromString (System.String
    text) [0x00000] in :0    at
    System.Drawing.ColorTranslator.FromHtml (System.String htmlColor)
    [0x00000] in :0    at
    Mono.TextEditor.Highlighting.ColorScheme.GetColorFromString
    (System.String colorString) [0x001c0] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/ColorScheme.cs:578
    at Mono.TextEditor.Highlighting.ColorScheme.SetChunkStyle
    (System.String name, System.String weight, System.String foreColor,
    System.String backColor) [0x00038] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/ColorScheme.cs:514
    at Mono.TextEditor.Highlighting.ColorScheme.ReadStyleTree
    (System.Xml.XmlReader reader, Mono.TextEditor.Highlighting.ColorScheme
    result, System.String curName, System.String curWeight, System.String
    curColor, System.String curBgColor) [0x000b8] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/ColorScheme.cs:599
    at
    Mono.TextEditor.Highlighting.ColorScheme+c__AnonStorey32.&lt;>m__43
    () [0x000e0] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/ColorScheme.cs:625
    at
    Mono.TextEditor.Highlighting.XmlReadHelper+c__AnonStorey19.&lt;>m__D
    (Mono.TextEditor.Highlighting.ReadCallbackData data) [0x00000] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/XmlReadHelper.cs:55
    at Mono.TextEditor.Highlighting.XmlReadHelper.ReadList
    (System.Xml.XmlReader reader, ICollection<code>1 endNodes,
    Mono.TextEditor.Highlighting.ReaderCallbackWithData callback)
    [0x0008b] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/XmlReadHelper.cs:91
    at Mono.TextEditor.Highlighting.XmlReadHelper.ReadList
    (System.Xml.XmlReader reader, ICollection</code>1 endNodes,
    Mono.TextEditor.Highlighting.ReaderCallback callback) [0x0000d] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/XmlReadHelper.cs:54
    at Mono.TextEditor.Highlighting.XmlReadHelper.ReadList
    (System.Xml.XmlReader reader, System.String endNode,
    Mono.TextEditor.Highlighting.ReaderCallback callback) [0x00000] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/XmlReadHelper.cs:50
    at Mono.TextEditor.Highlighting.ColorScheme.LoadFrom
    (System.Xml.XmlReader reader) [0x00018] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/ColorScheme.cs:615
    at Mono.TextEditor.Highlighting.SyntaxModeService.LoadStyle
    (System.String name) [0x0003c] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/SyntaxModeService.cs:111
    --- End of inner exception stack trace ---   at Mono.TextEditor.Highlighting.SyntaxModeService.LoadStyle
    (System.String name) [0x00053] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/SyntaxModeService.cs:113
    at Mono.TextEditor.Highlighting.SyntaxModeService.GetColorStyle
    (System.String name) [0x0002c] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor.Highlighting/SyntaxModeService.cs:83
    at Mono.TextEditor.TextEditorOptions.GetColorStyle () [0x00000] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/TextEditorOptions.cs:492
    at MonoDevelop.SourceEditor.StyledSourceEditorOptions.GetColorStyle ()
    [0x00000] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/StyledSourceEditorOptions.cs:192
    at Mono.TextEditor.TextArea.OptionsChanged (System.Object sender,
    System.EventArgs args) [0x00038] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextArea.cs:685
    at Mono.TextEditor.TextArea.set_Options (ITextEditorOptions value)
    [0x00066] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextArea.cs:157
    at Mono.TextEditor.TextEditor.set_Options (ITextEditorOptions value)
    [0x00000] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextEditor.cs:414
    at MonoDevelop.SourceEditor.ExtensibleTextEditor..ctor
    (MonoDevelop.SourceEditor.SourceEditorView view) [0x00028] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/ExtensibleTextEditor.cs:75
    at MonoDevelop.SourceEditor.SourceEditorWidget..ctor
    (MonoDevelop.SourceEditor.SourceEditorView view) [0x00077] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/SourceEditorWidget.cs:284
    at MonoDevelop.SourceEditor.SourceEditorView..ctor () [0x000ca] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/SourceEditorView.cs:189
    at MonoDevelop.SourceEditor.SourceEditorDisplayBinding.CreateContent
    (FilePath fileName, System.String mimeType,
    MonoDevelop.Projects.Project ownerProject) [0x00000] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/addins/MonoDevelop.SourceEditor2/MonoDevelop.SourceEditor/SourceEditorDisplayBinding.cs:94
    at MonoDevelop.Ide.Gui.LoadFileWrapper.Invoke (System.String fileName)
    [0x00033] in
    /home/builduser/buildslave/monodevelop/build/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:1182</p>
  </blockquote>