通过Applescript将文件添加到Xcode项目目标

核心问题似乎是这个错误：
Xcode出错：工作区文档“project.xcworkspace”的项目“TestProject”的Xcode 3组ID“D82DCFB50E8000A5005D6AD8”的文件引用ID“DCDCC17E13819A8E004B4E75”不理解添加消息.

在这条线上：

add fileRef to first target of testProject

其中fileRef是设置为新创建的文件引用的变量,testProject是设置为包含fileRef的项目的变量.

这是代码：

on run argv

-- Get the folder containing items to be added to the project
tell application "Finder"
    set thisScript to path to me
    set projectFolder to get folder of thisScript as string
    set sourceFolder to projectFolder & "FilesToAdd:"
end tell

-- Get all the files that will be added to Xcode
tell application "System Events"
    set filesToAddList to the name of every disk item of (sourceFolder as alias)
end tell

tell application "Xcode"
    -- Open the project using posix-style paths
    open ((POSIX path of projectFolder) & "TestProject.xcodeproj")

    -- Give Xcode some time to open the project before we start giving it commands
    delay 1

    set testProject to project "TestProject"
    tell testProject
        set sourceGroup to group "Sources"
        tell sourceGroup
            -- Iterate over all files in the list
            repeat with i in filesToAddList

                set fileName to (contents of i)

                -- Get the file path using Unix-style pathing,since that is the kind that Xcode needs
                set filePath to (POSIX path of sourceFolder) & fileName

                -- Don't add duplicate file references
                if filePath is not in path of file references in sourceGroup then
                    -- Add a new file reference to the project
                    set fileRef to make new file reference with properties {name:fileName,full path:filePath,path type:absolute,path:filePath,file encoding:macos roman}

                    -- Add the file reference to the build target
                    add fileRef to first target of testProject
                end if
            end repeat

        end tell -- end group tell

    end tell -- end project tell

end tell -- end app tell

end run

我已经查找了向目标添加文件的其他示例,看起来这是最干净,最简洁的方法,而且它似乎过去曾为其他人工作过.是否有不同的方式将文件引用添加到目标？

作为参考,我正在运行OSX 10.6.7和Xcode 4.0.2.