iTunes requires shared folders to authorize any purchases you make from the iTunes Music Store. Should this folder be moved or deleted, or have the permissions changed, users could experience several issues with authorization.
You may not be able to play purchased music, buy songs from the iTunes Music Store, or you could see the following:
"There was an error storing your authorization information on this computer. The required directory was not found or has a permission error."
If you have experienced any of these issues, you can resolve the issue by following these steps:
- Log in to an administrator account on your computer and navigate to Go > Go to Folder
- Type: /Users and click Go.
- Look for the "Shared" folder. If there is not one, you must create it. From the Finder menu bar, click File > New Folder, or Press (Command + Shift + N) to create a new folder. Name the new folder "Shared".
- Highlight the new "Shared" folder and press (Command + I) to Get Info.
- Click the disclosure triangle for "Ownership and Permissions" ("Sharing and Permissions" in Snow Leopard). Set the permissions to match this setup (you may be required to authenticate using your administrator password):
- Close the Get Info window and attempt to access your iTunes Store Account.
For the discerning Terminal user, you can solve this issue by implementing a couple quick commands. Keep in mind that using Terminal can be tricky for novice users. Entering incorrect commands can corrupt your system. Please only use Terminal if you are comfortable with the Unix environment.
- Open Terminal. Enter the following:
sudo mkdir -p /Users/Shared
- Press Return. Enter your administrator password and press return again.
- For systems running Mac OS X 10.5.8 or earlier, type:
sudo chmod 777 /Users/SharedFor systems running Mac OS X 10.6 or greater, type:
sudo chmod 1777 /Users/Shared
- Press Return and Quit Terminal.
For information on how to solve this issue on a Windows machine, visit this Apple knowledge base article.