问雪豹上iOS SDK4.3安装错误

EN

PackageKit: Install Failed: PKG: extracting 
"com.apple.pkg.DevToolsDocumentationLeo"
Error Domain=PKInstallErrorDomain Code=110         
UserInfo=0x10041cb90 "An error occurred while extracting files from the package “DevToolsDocumentation.pkg”."     
Underlying Error=(Error Domain=NSCocoaErrorDomain Code=259 "The file couldn’t be opened because it isn’t in the   
correct format.") {
    NSFilePath = "/var/folders/zz/zzzivhrRnAmviuee+++++++++++/Cleanup At 
    Startup/PKInstallSandbox-tmp/Root";
    NSLocalizedDescription = "An error occurred while extracting files  
    from the package \U201cDevToolsDocumentation.pkg\U201d.";
    NSURL = "../Packages/DevToolsDocumentation.pkg -
    - file://localhost/Applications/Install%20Xcode.app/Contents/Resources/Xcode.mpkg/";
    NSUnderlyingError = "Error Domain=NSCocoaErrorDomain Code=259 \"The file couldn\U2019t be opened because it isn\U2019t in the correct format.\"";
    PKInstallPackageIdentifier = "com.apple.pkg.DevToolsDocumentationLeo";
}
Sep 20 19:54:54 iMac installer[164]: install:didFailWithError:Error Domain=PKInstallErrorDomain     
Code=110 UserInfo=0x10041cb90 "An error occurred while extracting files from the package  
“DevToolsDocumentation.pkg”." Underlying Error=(Error Domain=NSCocoaErrorDomain Code=259 "The file couldn’t be  
opened because it isn’t in the correct format.")