Reaperscape

my server was running. i went to get back on today after i had shut my pc off last night. and now my server wont start up. any thoughts? this is what the log file says: Error parsing configfile property 'servername': Unknown config option. Make sure your configfile is updated the current server version! Startup aborted due to the given error in server configfile. not sure on how to fix it. i havent changed from the time it was running till the time it wasnt.