Monodevelop can not open file

Hi guys,

Today I opened my unity, double clicked a script file in ‘Project’ tab inside the editor, and Monodevelop cames out. This is all as usual, except that monodevelop says “Could not open file” and here is the detail:

System.TypeLoadException: Could not load type ‘Boo.MonoDevelop.Completion.BooEditorCompletion’ from assembly ‘Boo.MonoDevelop, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null’.
at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object parameters, System.Globalization.CultureInfo culture) [0x00000] in :0
at System.Reflection.MonoCMethod.Invoke (BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object parameters, System.Globalization.CultureInfo culture) [0x00000] in :0
at System.Reflection.ConstructorInfo.Invoke (System.Object parameters) [0x00000] in :0
at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in :0
at System.Activator.CreateInstance (System.Type type) [0x00000] in :0
at Mono.Addins.TypeExtensionNode.CreateInstance () [0x00000] in /Users/levi/Code/unity/mono-addins/Mono.Addins/Mono.Addins/TypeExtensionNode.cs:93
at MonoDevelop.Ide.Gui.Document.OnDocumentAttached () [0x0007b] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Document.cs:513
at MonoDevelop.Ide.Gui.Workbench.WrapDocument (IWorkbenchWindow window) [0x0004f] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:594
at MonoDevelop.Ide.Gui.ViewCommandHandlers…ctor (IWorkbenchWindow window) [0x0000d] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/ViewCommandHandlers.cs:49
at MonoDevelop.Ide.Gui.SdiWorkspaceWindow…ctor (MonoDevelop.Ide.Gui.DefaultWorkbench workbench, IViewContent content, Gtk.Notebook tabControl, MonoDevelop.Components.TabLabel tabLabel) [0x000d2] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/SdiWorkspaceWindow.cs:90
at MonoDevelop.Ide.Gui.DefaultWorkbench.ShowView (IViewContent content, Boolean bringToFront) [0x00113] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/DefaultWorkbench.cs:380
at MonoDevelop.Ide.Gui.LoadFileWrapper.Invoke (System.String fileName) [0x0019b] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:1042
at MonoDevelop.Ide.Gui.Workbench.RealOpenFile (MonoDevelop.Ide.Gui.FileOpenInformation openFileInfo) [0x0034b] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:747
at MonoDevelop.Ide.Gui.Workbench.OpenDocument (FilePath fileName, Int32 line, Int32 column, Boolean bringToFront, System.String encoding, IDisplayBinding binding, Boolean highlightCaretLine) [0x001ba] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:406
at MonoDevelop.Ide.Gui.Workbench.OpenDocument (FilePath fileName, Int32 line, Int32 column, Boolean bringToFront, System.String encoding, IDisplayBinding binding) [0x00000] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:351
at MonoDevelop.Ide.Gui.Workbench.OpenDocument (FilePath fileName, Int32 line, Int32 column, Boolean bringToFront) [0x00000] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:331
at MonoDevelop.Ide.IdeApp.OpenFiles (IEnumerable`1 files) [0x001a8] in /BuildAgent/work/93beeebf637645f/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide/Ide.cs:326

I’ve tried another project but the same problem. I think there is something wrong with my monodevelop, maybe I didn’t quit it in the right way last night.

anyone have any idea?

I suggest you reinstall (eg. via Unity reinstall). Seems you lost some files. Might be a good time to check your backups are in order too…

I’m not sure what’s actually happening but I’d just try and eliminate possible issues.

  1. Have you tried creating/saving/loading a file using MonoDevelop alone in a new project?
  2. Try opening the files your having trouble with in a text editor like notepad++ or your favourite text editor to see if the files are damaged. Re-save them and see if they open in MonoDevelop then.(unlikely to be the issue though by what you’ve said)
  3. You should also just try reinstalling MonoDevelop.

I know these are basic things but it’s worth getting through them before spending hours banging your head against the wall if its something simple.

I got the same problem as arn.zhan today when I started Unity and tried to open a script. I get exactly the same error as arn.zhan. I can’t open any file in Monodevelop but it works in other programs. I’ve tried making a new project with new scripts, but the same error. I’ve also tried to uninstall Unity and then install it again. But nothing seems to work.

Does anyone have any suggestions on what to do to fix the problem?