HaplotypeCaller error: Argument with name 'mbq' isn't defined

Hi, I ran HaplotypeCaller with the following command

java -jar GenomeAnalysisTK-2.8-1-g932cd3a/GenomeAnalysisTK.jar -T HaplotypeCaller -minPruning 3 -R genome.fasta -I reduced.bam -o Chr10.vcf -stand_call_conf 50 -mbq 20 --dbsnp /home/bioinfo/data/genomes/rice/nipponbare_v7.0/variations/all_sorted.vcf

and it gave the following message with the error:

ERROR A USER ERROR has occurred (version 2.8-1-g932cd3a):

ERROR

ERROR MESSAGE: Argument with name 'mbq' isn't defined.

I was wondering what am I doing wrong. I see that -mbq is defined in the haplotypeCaller page. Was it not defined in the version 2.8.1?

Thanks