Bwa Index error=12

[eseq_prak]

Hello,
Im having an index error as well. I am trying to index human genome build 37. I am using bwa 0.6.2 on a Mac OS 10.5.8, 64 bit, 8GB of RAM and 280GB of space.
When I run the command:
bwa index -a bwtsw -p human_g1k_v37 human_g1k_v37.fasta

BWA starts indexing the genome but stops and provides an error message (error code=12)

BWTIncConstructFromPacked] 630 iterations done. 1740074246 characters processed.
[BWTIncConstructFromPacked] 640 iterations done. 1778041526 characters processed.
[BWTIncConstructFromPacked] 650 iterations done. 1811782918 characters processed.
[BWTIncConstructFromPacked] 660 iterations done. 1841768294 characters processed.
[BWTIncConstructFromPacked] 670 iterations done. 1868415350 characters processed.
[BWTIncConstructFromPacked] 680 iterations done. 1892095270 characters processed.
[bwt_gen] Finished constructing BWT in 688 iterations.
[bwa_index] 2010.81 seconds elapse.
[bwa_index] Update BWT... bwa(3627) malloc: *** mmap(size=3101806592) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Bus error

Any Help with this will be appreciated.

Thanks a bunch!