Xcode: Erro -> Falha na compilação -> Atualize seu cliente Subversion para usar esta cópia de trabalho

Estou usando o Xcode 4.2.1. e tenho esse problema ao executar um aplicativo existente no simulador do iOS:

svn: The path '.' appears to be part of a Subversion 1.7 or greater
working copy.  Please upgrade your Subversion client to use this
working copy.
/Users/me/Library/Developer/Xcode/DerivedData/myproject-dxfzldckuqdmlrghowwkdrbgoigy/Build    /Intermediates/myproject.build/Debug-iphonesimulator/MyProject.build/Script-9567AEA113C59633000AA291.sh: No Subversion revision found at /Users/me/Library/Developer/Xcode/DerivedData/myproject-dxfzldckuqdmlrghowwkdrbgoigy/Build/Intermediates/myproject.build/Debug-iphonesimulator/MyProject.build/Script-9567AEA113C59633000AA291.sh line 32.
Building revision 
Command /bin/sh failed with exit code 1

Tenho um servidor Subversion 1.7.1 instalado e também no lado do cliente atualizei para 1.7.1. Eu fiz umsvn upgrade e recebo esse erro no Xcode.

Se eu repetir osvn upgrade no terminal recebo a mensagemCan't upgrade '...' as it is not a pre-1.7 working copy directory.

Então, o que está errado? Como eu resolvo o problema?

tenciosamente Tim

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