I checked your account and step data did upload for the last few days. Are you still receiving the server error? When are you receiving it? Have you tried all the troubleshooting in our FAQ:
What should I do if I receive a server error while using Garmin Express? http://support.garmin.com/support/searchSupport/simpleCase.htm?caseId={dd8e8b20-ef1e-11e2-7dd9-000000000000}&kbName=garmin
Also, make sure that the time zone and all settings are correct in Garmin Connect.