Cannot install applications: error code -60008 I am trying to install new applications, but I keep getting this error message from the "Copy" application:


  The operation can’t be completed because an unexpected error occurred
  (error code -60008).


The applications I am trying to install are:   


git from git-2.2.1-intel-universal-mavericks.dmg
SourceTree from SourceTree_2.0.5.2.dmg


The message is given after I drag the application on the destination directory, and after being asked if I want it to replace the old one. 

In the past I had no problems with them.
After many attempts, the only way I could install these applications has been through a manual copy from the command line:  

sudo hdiutil attach ./SourceTree_2.0.5.2.dmg
sudo cp -r /Volumes/SourceTree/SourceTree.app /Applications/