You should take the following steps to try and fix the problem.

• Ensure that you have an internet connection.
• Make sure your username and password are correct. They are case sensitive.
• Try syncing again in an hour or two. Some errors occur because the service is temporarily unavailable.
• If all this doesn’t work, try uninstalling the application and reinstalling. You will need to go through the initial sync again, which may take a bit of time…but you should no longer have sync problems.
• If all this doesn’t work and you’re getting cryptic error codes, please write down the error code and tell customer support.