hcard and hentry errors

Any suggestions on how to fix the errors below? Thanks! From Google's Structured Data Testing Tool Extracted structured data ---------------- hatom-feed hatom-entry: Error: At least one field must be set for HatomEntry. Error: Missing required field "entry-title". Error: Missing required field "updated". Error: Missing required hCard "author". Error: At least one field must be set for HatomEntry. Error: Missing required field "entry-title". Error: Missing required field "updated". Error: Missing required hCard "author". Error: At least one field must be set for HatomEntry. Error: Missing required field "entry-title". Error: Missing required field "updated". Error: Missing required hCard "author". Error: At least one field must be set for HatomEntry. Error: Missing required field "entry-title". Error: Missing required field "updated". Error: Missing required hCard "author". Error: Missing required field "updated". Error: Missing required hCard "author".