Ragnarok DS (U) Freezing Problem (with save)

Hey, my Ragnarok game keeps freezing. After the golden thief bug story quest, I go to the Order of Knights. After the scene where Lucifi leaves and they go to the INN, it stays on the black screen. Can anyone figure out why this happens? I previously used cheats but I've turned off soft reset and took off all the cheats. If anyone could help me fix this it would be a great helpthanksthe save file is here
http://www.mediafire.com/?n2xnodgnwwmSORRY guys I forgot to mention I'm using an R4 with latest firmware 1.18
also I play this on the DS lite

well i dont know much but you should use google..... dont know much for the R4