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I'm not sure what exactly happens, but when I had added Console.WriteLine (ex.ToString ()) to DotNetProject.cs, I've managed to get following stack trace:
System.TypeLoadException: A type load exception has occurred.
at MonoDevelop.Debugger.DebuggerEngine.CreateSession () [0x00006] in /build/buildd/monodevelop-latest-1336547739/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger/DebuggerEngine.cs:97
at MonoDevelop.Debugger.DebuggingService.InternalRun (MonoDevelop.Core.Execution.ExecutionCommand cmd, MonoDevelop.Debugger.DebuggerEngine factory, IConsole c) [0x0005d] in /build/buildd/monodevelop-latest-1336547739/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger/DebuggingService.cs:505
at MonoDevelop.Debugger.DebugExecutionHandler.Execute (MonoDevelop.Core.Execution.ExecutionCommand command, IConsole console) [0x00000] in /build/buildd/monodevelop-latest-1336547739/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger/DebugExecutionHandlerFactory.cs:70
at MonoDevelop.Debugger.DebugExecutionHandlerFactory.Execute (MonoDevelop.Core.Execution.ExecutionCommand command, IConsole console) [0x0000e] in /build/buildd/monodevelop-latest-1336547739/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger/DebugExecutionHandlerFactory.cs:51
at MonoDevelop.Projects.DotNetProject.DoExecute (IProgressMonitor monitor, MonoDevelop.Projects.ExecutionContext context, MonoDevelop.Projects.ConfigurationSelector configuration) [0x000b2] in /tmp/mdev/monodevelop-latest-1336547739/main/src/core/MonoDevelop.Core/MonoDevelop.Projects/DotNetProject.cs:1157
For some reason Mono doesn't even fill TypeName property of TypeLoadException so I cann't find the class that causes the exception.
Can you provide more info about the versions of MD and Mono, and your OS/distro?
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Mono JIT compiler version 184.108.40.206 (Debian 220.127.116.11-1ubuntu2)
Copyright (C) 2002-2011 Novell, Inc, Xamarin, Inc and Contributors. www.mono-project.com
LLVM: supported, not enabled.
GC: Included Boehm (with typed GC and Parallel Mark)
MonoDevelop from Git, configure options: .--prefix=/usr --profile=dist
Actually it works fine when I start it with make run, but gives me that exception when I try to use installed version.
Hm, when I've copied everything from main/build/bin to /usr/lib/monodevelop/bin, it works again.
I've found the issue: Mono.Cecil.Mdb.dll isn't installed at all and because of that MonoDevelop is unable to load debugger.
Solution: add Mono.Cecil.Mdb.dll to the list of files to be installed.
Looks like install targets got broken.
Yes, this was my bad. I missed the .Mdb library when switching to the cecil submodule. I only included Mono.Cecil.dll and Mono.Cecil.dll.mdb.
Fixed in master and 3.0-series.