thanks
here is the result
if you can understand something, i will be happy
Jul 22 19:09:33 imac-de-david installd[845]: PackageKit: Install Failed: Error Domain=PKInstallErrorDomain Code=110 "An error occurred while extracting files from the package “DeveloperTools.pkg”." UserInfo=0x7feec501c300 {NSLocalizedDescription=An error occurred while extracting files from the package “DeveloperTools.pkg”., NSFilePath=/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root, NSURL=file://localhost/Volumes/Stock/Install%20Xcode.app/Contents/Resources/Pac kages/DeveloperTools.pkg, PKInstallPackageIdentifier=com.apple.pkg.DeveloperToolsLeo, NSUnderlyingError=0x7feec61764b0 "The file couldn’t be opened because it isn’t in the correct format."} {
NSFilePath = "/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root";
NSLocalizedDescription = "An error occurred while extracting files from the package \U201cDeveloperTools.pkg\U201d.";
NSURL = "file://localhost/Volumes/Stock/Install%20Xcode.app/Contents/Resources/Packages /DeveloperTools.pkg";
NSUnderlyingError = "Error Domain=NSCocoaErrorDomain Code=259 \"The file couldn\U2019t be opened because it isn\U2019t in the correct format.\"";
PKInstallPackageIdentifier = "com.apple.pkg.DeveloperToolsLeo";
}
Jul 22 19:09:33 imac-de-david installer[843]: install:didFailWithError:Error Domain=PKInstallErrorDomain Code=110 "An error occurred while extracting files from the package “DeveloperTools.pkg”." UserInfo=0x7f9edb1119a0 {NSUnderlyingError=0x7f9edb1127e0 "The file couldn’t be opened because it isn’t in the correct format.", NSFilePath=/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root, NSURL=file://localhost/Volumes/Stock/Install%20Xcode.app/Contents/Resources/Pac kages/DeveloperTools.pkg, PKInstallPackageIdentifier=com.apple.pkg.DeveloperToolsLeo, NSLocalizedDescription=An error occurred while extracting files from the package “DeveloperTools.pkg”.}
Jul 22 19:09:33 imac-de-david installer[843]: Install failed: The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
imac-de-david:~ daphi3$