XCode 5で作ったプロジェクトをXCode 6で開いたら、こちらのエラーが出ていてビルド出来ません。  
解決策をご教授願います。

```

    clang: error: no such file or directory: '/Users/username/Documents/XCode/Projects/Projects/CollecCell.m'
    clang: error: no input files
    Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1
    
```

試行錯誤してみましたがお手上げです。よろしくお願いします。
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ios objective-c xcode6 iphone
Apple LLVM 6.0 Error
まったく同じ内容の質問が英語版にありました。  
ビルドターゲットの設定を見直すということのようですが。

  * <https://stackoverflow.com/questions/24052293/apple-llvm-6-0-error>
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英語版のこちらにも似たような質問がありました。  
ご参考まで。

<https://stackoverflow.com/questions/13540973/clang-error-no-such-file-or-
directory>

> I eventually fixed the problem by just deleting the files in Xcode and re-
> adding them. Would be good to understand why this happened though. – Snow
> Crash Nov 24 '12 at 12:35

* * *

> I faced the same problem. Nothing helps me: neither re-adding, nor cleaning
> project, derivedData, nor setting paths manually. Then I found out, that the
> path to the group, where I wanted to add my file, was path to nowhere. I set
> existing path to my group and than files were added correctly. – Accid
> Bright Sep 5 '14 at 13:45
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