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

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    <p>I was trying to make a simple Mac Objective-C application with Xcode to keep score of two players playing a simple game with up to 36 scores per player. It isn't a very practical application because of its limited features, and it's mostly for practice. I was trying to expand the application a bit with a Preferences window, which would pop up when a menu item was clicked.</p> <p>I created a file to control the men item, then a nib to pop up when it's clicked. All of this worked fine, and a new window would pop up. I put sliders, text fields, etc. on the nib, and connected them to actions. All of that worked fine.</p> <p>The problem came when I tried to import the files into my root controller so that I could use the user's choices in the application.</p> <p>I got the following compiler error:</p> <pre><code>Command /Developer/usr/bin/clang failed with exit code 1 </code></pre> <p>Along with all of this:</p> <blockquote> <p>Ld "/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Products/Debug/SimpleScoreKeeper Mac.app/Contents/MacOS/SimpleScoreKeeper Mac" normal x86_64 cd "/Users/myusername/Dropbox/iphone app/SimpleScoreKeeper Mac" setenv MACOSX_DEPLOYMENT_TARGET 10.6 /Developer/usr/bin/clang -arch x86_64 -isysroot /Developer/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 -filelist "/Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/Debug/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"</p> <p>ld: duplicate symbol _addScores in /Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/Debug/SimpleScoreKeeper Mac.build/Objects-normal/x86_64/Prefrences.o and /Users/myusername/Library/Developer/Xcode/DerivedData/SimpleScoreKeeper_Mac-bjvjeiybvmwfjpfilvnpezarwkml/Build/Intermediates/SimpleScoreKeeper Mac.build/Debug/SimpleScoreKeeper Mac.build/Objects-normal/x86_64/RootController.o for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) Command /Developer/usr/bin/clang failed with exit code 1</p> </blockquote> <p>The (possibly) related files in my project follow.</p> <pre><code>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) </code></pre> <p>Is there a reason why I'd be getting this error? Is there something I need to do in the class I'm importing? Please be pretty detailed, I'm new to the language somight not know how to do certain things. And if there's anything I need to clarify, let me know.</p> <p>EDIT: Here's the code to the file I can't import.</p> <pre><code>#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 </code></pre>
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