GTK#-related error on MonoDevelop 2.8.5 on Ubuntu 11.04

Posted by Mehrdad on Stack Overflow See other posts from Stack Overflow or by Mehrdad
Published on 2012-01-14T04:53:55Z Indexed on 2012/10/15 21:37 UTC
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When I try to create a new solution in MonoDevelop 2.8.5 in Ubuntu 11.04 x64, it shows me:

System.ArgumentNullException: Argument cannot be null.
Parameter name: path1
  at System.IO.Path.Combine (System.String path1, System.String path2) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Core.FilePath.Combine (System.String[] paths) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Projects.ProjectCreateInformation.get_BinPath () [0x00000] in <filename unknown>:0 
  at MonoDevelop.Projects.DotNetProject..ctor (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation projectCreateInfo, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Projects.DotNetAssemblyProject..ctor (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation projectCreateInfo, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Projects.DotNetProjectBinding.CreateProject (System.String languageName, MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Projects.DotNetProjectBinding.CreateProject (MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Projects.ProjectService.CreateProject (System.String type, MonoDevelop.Projects.ProjectCreateInformation info, System.Xml.XmlElement projectOptions) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Ide.Templates.ProjectDescriptor.CreateItem (MonoDevelop.Projects.ProjectCreateInformation projectCreateInformation, System.String defaultLanguage) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Ide.Templates.ProjectTemplate.HasItemFeatures (MonoDevelop.Projects.SolutionFolder parentFolder, MonoDevelop.Projects.ProjectCreateInformation cinfo) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Ide.Projects.NewProjectDialog.SelectedIndexChange (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0 

I strace'd it and saw repeated failed accesses to files like:

/usr/lib/mono/gac/gtk-sharp/2.12.0.0__35e10195dab3c99f/libgtk-x11-2.0.so.0.la

so I'm assuming that's the cause of the problem.

However, I've installed (and re-installed) anything GTK#-related that I could think of... and the error still occurs.

Does anyone know how to fix it?

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