While trying to update my Android SDK I am encountering this error when trying to install this particular package:
You probably started the SDK manager from eclipse? I encoutnered the same problem, and fixed it by manually opening the SDK manager from the directy tools.
On Windows 7 and probably Vista, run Eclipse as administrator.
These are the steps followed by me.
First make a copy of tools folder in same directory (android-sdk or android-sdk-windows) then delete the original tools folder and then open the android.bat file by double clicking in tools-copy folder to launch sdk manager and install the tools.
If tools folder is not being deleted then use the unlocker LockHunter to delete the folder and then open android.bat to update the tools.
After successful installation of tools delete the tools-copy folder.
Close Eclipse or Android Studio if open.
It worked for me!!!
I just stopped the emulator, and problem was solved.
On my PC it was caused by monitor.exe running in the background. Terminating that proces solved the problem.