MonoDevelop Addin for NaCl using 'ProjectServiceExtensio

嗨，我

正在尝试制作一个 MonoDevelop 插件，我可以用来编译 NaCl 项目的 Mono...但是我收到一个空引用错误，并且找不到足够的信息来找出出了什么问题。

当我尝试从 MonoDevelop 中的插件创建项目时，就会发生空引用。所有资源都设置为构建为"嵌入式资源"。

建造者.cs：

using System;
using MonoDevelop.Projects;
using MonoDevelop.Core;
namespace MonoDevelop.MonoNaCl
{
    public class Builder : ProjectServiceExtension
    {
        protected override BuildResult Build (IProgressMonitor monitor, SolutionEntityItem item, ConfigurationSelector configuration)
        {
            Console.WriteLine("Yahoo Build");
            return base.Build (monitor, item, configuration);
        }
        protected override void Execute (IProgressMonitor monitor, SolutionEntityItem item, ExecutionContext context, ConfigurationSelector configuration)
        {
            Console.WriteLine("Yahoo Execute");
            base.Execute (monitor, item, context, configuration);
        }
    }
}

MonoDevelop.MonoNaCl.addin.xml：注意：我真的不清楚我应该使用的"扩展"，并认为问题就在那里。

<Addin namespace   = "MonoDevelop"
       id          = "MonoNaCl"
       name        = "Mono for NaCl"
       author      = "Andrew Witte"
       copyright   = "BSD"
       url         = "http://www.URL.com"
       description = "Support for developing MonoNaCl applications."
       category    = "NaCl Development"
       version     = "1.0">
    <Dependencies>
        <Addin id="Ide" version="3.0" />
        <Addin id="Core" version="3.0" />
    </Dependencies>
    <Extension path = "/MonoDevelop/Ide/ProjectTemplates">
        <ProjectTemplate id = "MonoNaClProject" resource = "MonoNaCl.xpt.xml"/>
    </Extension>
    <Extension path = "/MonoDevelop/ProjectModel/ProjectServiceExtensions">
        <Class class = "MonoDevelop.MonoNaCl.Builder"/>
    </Extension>
    <!--<Extension path = "/MonoDevelop/ProjectModel/MSBuildItemTypes">
        <SolutionItem type="MonoDevelop.MonoNaCl.Builder" extension="csproj" guid="{49DFC40D-C27A-4230-A637-8D9669269586}"/>
    </Extension>-->
    <Extension path="/MonoDevelop/ProjectModel/SerializableClasses">
        <DataType class="MonoDevelop.MonoNaCl.Builde" />
    </Extension>
</Addin>

MonoNaCl.xpt.xml：

<?xml version="1.0"?>
<Template originator = "Andrew Witte">
    <TemplateConfiguration>
        <_Name>MonoNaCl Project</_Name>
        <_Category>C#/MonoNaCl</_Category>
        <LanguageName>C#</LanguageName>
        <_Description>Creates a MonoNaCl project.</_Description>
    </TemplateConfiguration>
    <Combine name = "${ProjectName}" directory = ".">
        <Options>
            <StartupProject>${ProjectName}</StartupProject>
        </Options>
        <Project name = "${ProjectName}" directory = "." type = "MonoNaCl">
            <Options/>
        </Project>
    </Combine>
</Template>

这是尝试创建项目后的错误：

System.NullReferenceException: Object reference not set to an instance of an object
  at MonoDevelop.Projects.SolutionFolderItemCollection.OnItemAdded (MonoDevelop.Projects.SolutionItem item) [0x0000b] in /Users/builder/data/lanes/monodevelop-mac-3.0.1/6642975f/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects/SolutionFolderItemCollection.cs:59 
  at MonoDevelop.Projects.ItemCollection`1[MonoDevelop.Projects.SolutionItem].InsertItem (Int32 index, MonoDevelop.Projects.SolutionItem item) [0x00008] in /Users/builder/data/lanes/monodevelop-mac-3.0.1/6642975f/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects/ItemCollection.cs:39 
  at System.Collections.ObjectModel.Collection`1[MonoDevelop.Projects.SolutionItem].Add (MonoDevelop.Projects.SolutionItem item) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Ide.Templates.SolutionDescriptor.CreateEntry (MonoDevelop.Projects.ProjectCreateInformation projectCreateInformation, System.String defaultLanguage) [0x0026c] in /Users/builder/data/lanes/monodevelop-mac-3.0.1/6642975f/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Templates/SolutionDescriptor.cs:162 
  at MonoDevelop.Ide.Templates.ProjectTemplate.CreateWorkspaceItem (MonoDevelop.Projects.ProjectCreateInformation cInfo) [0x00000] in /Users/builder/data/lanes/monodevelop-mac-3.0.1/6642975f/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Templates/ProjectTemplate.cs:232 
  at MonoDevelop.Ide.Projects.NewProjectDialog.CreateProject () [0x001ef] in /Users/builder/data/lanes/monodevelop-mac-3.0.1/6642975f/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Projects/NewProjectDialog.cs:432