Xcode 5 DocSet Error

30.09.13 14:28:54,628 Xcode[71618]: [MT] DVTDownloadable: Error Domain=PKInstallErrorDomain Code=120 "Could not download and install Xcode 5 doc set. An unexpected error occurred while moving files to the final destination." UserInfo=0x7ffd0539d060 {NSLocalizedDescription=Could not download and install Xcode 5 doc set. An unexpected error occurred while moving files to the final destination., arguments=(
    "-f",
    "-s",
    "/var/folders/y2/11bntpy55xggwfcchfv8p5300000gn/Cleanup At Startup/PKInstallSandboxManager/1.sandbox/Root",
    "/Users/robin/Library/Developer/Shared/Documentation/DocSets"
), NSUnderlyingError=0x7ffd052b9490 "The operation couldn’t be completed. Permission denied"}