[NDS] Pokemon White - game sync problem

Well, I play clean pokemon white and have pokemon-gl account I play for almost a month.
Problem start yesterday, I kept getting error code 91010 which is http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=91010&system=DS&locale=en_US&action2.x=20&action2.y=18Problem is, I don't have anyone in my friend list. I just play for catching dream world pokemon and glowing berries.This error code makes me can't connect and put my pokemon in sleep for dream world anymore. :'(Anyone has suggestion?
Thanks.