Ok, got the URL from your old post. Looks like you have enabled the photostream plugin and some setting there is incorrect or missing.
Second, you have probably dragged and dropped the old twitter widget part of the theme which stopped working recently and we moved to Recent tweets plugin due to Twitter v1.1 API rollout (my fault – I should have removed it completely).
Pls remove the erstwhile twitter widget and disable or enter the required data for photostream plugin and you should do fine. Thanks.