I did but same thing. I think I am not writing the BLJS folder wrong. You see, the game was in an ISO file and I extracted it and created the BLJS folder manually with name "BLJS10258-[J-stars Victory VS ]". Maybe this has something to do with my problem?
Read more: http://www.ps3news.com/forums/ps3-help-support/ps3-japanese-game-error-help-129795.html#ixzz38Hvz2T71