MonoDevelop crash on opening one particular class

MonoDevelop is pretty stable for me, except when I try to open my App.cs class (which is an abstract singleton that manages various startup jobs in my game like loading the player's saves from disk etc). The code appears, then a second or two later I get a lengthy exception (below) and Mono vanishes. The class compiles and works fine in Unity itself.

Rather than post up the whole 130 line class, I'll just post the bits that look off the beaten track to me:

It's the only place I use Reflection

Code (csharp):

1.  
2. using System.Reflection;
3. using Holoville.HOTween;
4.  

And I'm using this directive to automatically version my builds with unique IDs (the *.* part gets replaced with a sort of encoded version of the date/time of compilation):

Code (csharp):

1.  
2. [assembly: AssemblyVersion("1.0.*.*")]
3.  

It's the only place I use conditional compilation and a vibration plugin from the asset store:

Code (csharp):

1.  
2.         #if UNITY_ANDROID
3.         vibrator.Vibrate(ms);  
4.         #endif
5.        
6.         #if UNITY_IOS
7.         Handheld.Vibrate();
8.         #endif
9.  

This is the exception from MonoDevelop:

Code (csharp):

1.  
2. System.InvalidOperationException: Sequence contains no elements
3.    at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
4.    at ICSharpCode.NRefactory.CSharp.CSharpParser.ConversionVisitor.ConvertAttributeSection(List`1 optAttributes) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\CSharpParser.cs:line 261
5.    at ICSharpCode.NRefactory.CSharp.CSharpParser.ConversionVisitor.AddAttributeSection(AstNode parent, Attributes attrs) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\CSharpParser.cs:line 827
6.    at ICSharpCode.NRefactory.CSharp.CSharpParser.ConversionVisitor.AddAttributeSection(AstNode parent, Attributable a) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\CSharpParser.cs:line 819
7.    at ICSharpCode.NRefactory.CSharp.CSharpParser.ConversionVisitor.Visit(Class c) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\CSharpParser.cs:line 390
8.    at Mono.CSharp.Class.Accept(StructuralVisitor visitor) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\mcs\class.cs:line 2516
9.    at Mono.CSharp.StructuralVisitor.VisitNamespaceBody(Namespace nspace) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\mcs\visit.cs:line 59
10.    at ICSharpCode.NRefactory.CSharp.CSharpParser.ConversionVisitor.Visit(Namespace nspace) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\CSharpParser.cs:line 297
11.    at Mono.CSharp.UsingsBag.Namespace.Accept(StructuralVisitor visitor) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\mcs\location.cs:line 782
12.    at ICSharpCode.NRefactory.CSharp.CSharpParser.Parse(CompilerCompilationUnit top, Int32 line) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\contrib\ICSharpCode.NRefactory\CSharp\Parser\CSharpParser.cs:line 3411
13.    at MonoDevelop.CSharp.Parser.McsParser.Parse(ProjectDom dom, String fileName, String content) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\addins\CSharpBinding\MonoDevelop.CSharp.Parser\McsParser.cs:line 137
14.    at MonoDevelop.Projects.Dom.Parser.ProjectDomService.DoParseFile(ProjectDom dom, String fileName, String fileContent) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\MonoDevelop.Core\MonoDevelop.Projects.Dom.Parser\ProjectDomService.cs:line 975
15.    at MonoDevelop.Projects.Dom.Parser.ProjectDomService.ParseFile(ProjectDom dom, String fileName, Func`1 getContent) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\MonoDevelop.Core\MonoDevelop.Projects.Dom.Parser\ProjectDomService.cs:line 251
16.    at MonoDevelop.Projects.Dom.Parser.ProjectDomService.ParseFile(ProjectDom dom, String fileName) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\MonoDevelop.Core\MonoDevelop.Projects.Dom.Parser\ProjectDomService.cs:line 244
17.    at MonoDevelop.Projects.Dom.Parser.ProjectDomService.GetParsedDocument(ProjectDom dom, String fileName) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\MonoDevelop.Core\MonoDevelop.Projects.Dom.Parser\ProjectDomService.cs:line 265
18.    at MonoDevelop.CSharp.Highlighting.CSharpSyntaxMode.CSharpSpanParser.ConditinalExpressionEvaluator..ctor(Document doc) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\addins\CSharpBinding\MonoDevelop.CSharp.Highlighting\CSharpSyntaxMode.cs:line 442
19.    at MonoDevelop.CSharp.Highlighting.CSharpSyntaxMode.CSharpSpanParser.ScanSpan(Int32 i) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\addins\CSharpBinding\MonoDevelop.CSharp.Highlighting\CSharpSyntaxMode.cs:line 540
20.    at Mono.TextEditor.Highlighting.SyntaxMode.SpanParser.ParseSpans(Int32 offset, Int32 length) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor.Highlighting\SyntaxMode.cs:line 453
21.    at Mono.TextEditor.Highlighting.SyntaxMode.ChunkParser.GetChunks(Int32 offset, Int32 length) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor.Highlighting\SyntaxMode.cs:line 657
22.    at Mono.TextEditor.Highlighting.SyntaxMode.GetChunks(Document doc, ColorSheme style, LineSegment line, Int32 offset, Int32 length) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor.Highlighting\SyntaxMode.cs:line 78
23.    at Mono.TextEditor.TextViewMargin.GetCachedChunks(SyntaxMode mode, Document doc, ColorSheme style, LineSegment line, Int32 offset, Int32 length) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor\TextViewMargin.cs:line 859
24.    at Mono.TextEditor.TextViewMargin.<>c__DisplayClassd.<CreateLinePartLayout>b__a(LayoutWrapper wrapper) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor\TextViewMargin.cs:line 1048
25.    at Mono.TextEditor.TextViewMargin.GetCachedLayout(LineSegment line, Int32 offset, Int32 length, Int32 selectionStart, Int32 selectionEnd, Action`1 createNew) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor\TextViewMargin.cs:line 796
26.    at Mono.TextEditor.TextViewMargin.CreateLinePartLayout(SyntaxMode mode, LineSegment line, Int32 logicalRulerColumn, Int32 offset, Int32 length, Int32 selectionStart, Int32 selectionEnd) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor\TextViewMargin.cs:line 1040
27.    at Mono.TextEditor.TextViewMargin.VisualLocationTranslator.PointToLocation(Double xp, Double yp) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor\TextViewMargin.cs:line 2351
28.    at Mono.TextEditor.TextEditor.ShowTooltip(ModifierType modifierState) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor\TextEditor.cs:line 2325
29.    at Mono.TextEditor.TextEditor.FireMotionEvent(Double x, Double y, ModifierType state) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor\TextEditor.cs:line 1152
30.    at Mono.TextEditor.TextEditor.OnMotionNotifyEvent(EventMotion e) in c:\BuildAgent\work\f07246b5212f7be4\monodevelop\main\src\core\Mono.Texteditor\Mono.TextEditor\TextEditor.cs:line 1110
31.    at Gtk.Widget.motionnotifyevent_cb(IntPtr widget, IntPtr evnt)
32.  

 

Figured this out in the end, with a friend of mine who knows C# far better than me. The automatic version attribute is meant to be in an AssemblyInfo.cs file, in a Properties folder. As soon as I did that, MonoDevelop could open all my files again without crashing. Hope this saves someone from the same issue in the future.