PS2 Beats of Rage - Dragons of Rage Mod Help!

hi, when ever i try to play Dragons of rage mod on my ps2, it keeps comming up with erros saying not enough memory.

i can play original bor with no probs, but it always crashes ith dor.
it doesnt keep crashin in the same place tho, i got all the way to selecting a character, but when t tried to load the level, it crashed.

i downloaded it from http://www.gp32x.de/cgi-bin/cfiles.cgi?0,0,0,0,11,410

altho, when i burned it, i downloaded bin & cue image files of original bor, and extracted it with winiso, and replaced bor.pak with dragons of rage, but i did rename it to bor.pak.

could that be the problem??