Check your KeychainAccessGroups.plist and KeychainAccessGroups2.plist.
Change the keychain-access-item item0 and itme1 groups by doing the following:
- Go to Organizer → Devices → Profiling (in the upper left corner)
- Find the Provisioning profile that you use to sign the application and click it
- Look for "Application ID" in which your application ID
If your application identifier for the initialization file is ABC123CDF456. *,
item0 - ABC123CDF456.com.yourcompany.GenericKeychain2,
item1 is ABC123CDF456.com.yourcompany.GenericKeychainSuite