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I've just updated via the Xamarin.Studio autoupdate tool (beta channel).
So my current versions are:
I have a solution that was building fine with Mono 3.0.6, now when I build from Monodevelop all works fine as I expected, but when I'm running make from command line (which invokes mdtool to build the solution) I have this stack trace in the output and the build fails:
System.NullReferenceException: Object reference not set to an instance of an object
at Mono.Addins.ExtensionNode.add_ExtensionNodeChanged (Mono.Addins.ExtensionNodeEventHandler value) [0x00007] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/external/mono-addins/Mono.Addins/Mono.Addins/ExtensionNode.cs:170
at Mono.Addins.ExtensionContext.AddExtensionNodeHandler (System.String path, Mono.Addins.ExtensionNodeEventHandler handler) [0x0001f] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/external/mono-addins/Mono.Addins/Mono.Addins/ExtensionContext.cs:693
at Mono.Addins.AddinManager.AddExtensionNodeHandler (System.String path, Mono.Addins.ExtensionNodeEventHandler handler) [0x0000a] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/external/mono-addins/Mono.Addins/Mono.Addins/AddinManager.cs:727
at MonoDevelop.Core.Assemblies.TargetRuntime.EnsureInitialized () [0x0006d] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Assemblies/TargetRuntime.cs:366
at MonoDevelop.Core.Assemblies.TargetRuntime.get_RuntimeAssemblyContext () [0x00000] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Assemblies/TargetRuntime.cs:175
at MonoDevelop.Core.AddIns.PackageInstalledCondition.Evaluate (NodeElement conditionNode) [0x00000] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.AddIns/PackageInstalledCondition.cs:37
at MonoDevelop.Core.AddIns.PackageNotInstalledCondition.Evaluate (NodeElement conditionNode) [0x00000] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.AddIns/PackageInstalledCondition.cs:58
at Mono.Addins.Condition.Evaluate (Mono.Addins.ExtensionContext ctx) [0x00046] in /Users/builder/data/lanes/monodevelop-lion-evolve_fixed/a8bf58d3/source/monodevelop/main/external/mono-addins/Mono.Addins/Mono.Addins/ConditionType.cs:213
* Assertion at threads.c:1360, condition `internal' not met
Happy to provide other information if needed, for now I fix by reverting to Mono 3.0.6 (haven't tried versions in the middle).
Some further information on this:
3.0.8 works fine, 3.0.10 doesn't. Verified this last week.
I'm experiencing the same issues on OS/X with the latest Xamarin beta. Any ideas on how to fix this?
This is a known issue in 3.0.10. Please update to 3.0.12.
What's the proper way to upgrade mdtool? Is it to install the Xamarin Studio Alpha?
mdtool is ok, you have to upgrade Mono. Mono 3.0.12 is already in the alpha/beta channel.