System.NullReferenceException when exporting sounds under character voice lines in revo_kart.brsar

[lotkey]

I am trying to export Dry Bone's sounds (and eventually replace them) but I cannot play the sounds in BrawlBox and when I try to export them I get the null reference error. I get the same issue with these folders: VO/KA, VO/NK, VO/KT, VO/TITLE, and VO/BK.