命令 /Developer/usr/bin/clang 失败，退出代码 1

我试图使用 Xcode 制作一个简单的 Mac Objective-C 应用程序，以记录玩简单游戏的两名玩家的得分，每个玩家最多 36 分。由于其功能有限，它不是一个非常实用的应用程序，并且主要用于练习。我试图使用“首选项”窗口稍微扩展应用程序，单击菜单项时会弹出​​该窗口。

我创建了一个文件来控制男士项目，然后单击它时会弹出一个笔尖。所有这些都运行良好，并且会弹出一个新窗口。我将滑块、文本字段等放在笔尖上，并将它们连接到操作。所有这些都运行良好。

当我尝试将文件导入我的根控制器以便我可以在应用程序中使用用户的选择时，问题就出现了。

我收到以下编译器错误：

Command /Developer/usr/bin/clang failed with exit code 1

除此之外：

LD “/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug/SimpleScoreKeeper Mac.app/Contents/MacOS/SimpleScoreKeeper Mac”正常 x86_64 cd "/Users/我的用户名/Dropbox/iphone 应用程序/SimpleScoreKeeper Mac” setenv MACOSX_DEPLOYMENT_TARGET 10.6 /Developer/usr/bin/clang -arch x86_64 -isysroot /开发者/SDKs/MacOSX10.6.sdk -L/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug -F/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug -文件列表 “/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/调试/SimpleScoreKeeper Mac.build/Objects-normal/x86_64/SimpleScoreKeeper Mac.LinkFileList” -mmacosx-version-min=10.6 -framework Cocoa -o “/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug/SimpleScoreKeeper Mac.app/Contents/MacOS/SimpleScoreKeeper Mac”

ld: 重复符号 _addScores /Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/调试/SimpleScoreKeeper Mac.build/Objects-normal/x86_64/Prefences.o 和 /Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/调试/SimpleScoreKeeper Mac.build/Objects-normal/x86_64/RootController.o 用于架构 x86_64 clang: 错误: 链接器命令失败，退出代码 1（使用 -v 来 请参阅调用）命令 /Developer/usr/bin/clang 失败并退出代码 1

我的项目中的（可能）相关文件如下。

RootController.h - All the interface declarations for stuff in the MainMenu.xib window
RootController.m - Where I need to import the files to
MainMenu.xib - The nib owned by the RootController class
Preferences.h - A file I'd want to import, but it won't work.
Preferences.m - A file I'd (maybe) want to import, but it won't work.
Preferences.xib - The nib owned by the Preferences class.
PreferencesMenuController.h - Where I declare the clickPreferences action. (Liked to MainMenu.xib)
PreferencesMenuController.m - Where I say that clickPreferences opens up Preferences nib.  (Linked to MainMenu.xib)

我会收到此错误有什么原因吗？我需要在导入的课程中做一些事情吗？请非常详细，我是这门语言的新手，可能不知道如何做某些事情。如果有什么我需要澄清的，请告诉我。

编辑： 这是我无法导入的文件的代码。

#import "Preferences.h"

@implementation Preferences

int addScores;

- (IBAction)addScoresToggled
{
    NSLog(@"addScores was toggled.");
}


- (id)initWithWindow:(NSWindow *)window
{
    self = [super initWithWindow:window];
    if (self) {

    }

    return self;
}

- (void)dealloc
{
    [super dealloc];
}

- (void)windowDidLoad
{
    [super windowDidLoad];
}

@end

如果您不小心包含了实现文件而不是头文件，也可能会出现此错误。例如#import“MyClass.m”而不是#import“MyClass.h”