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Malformed walker argument

I am trying to use ReadBackedPhasing ([http://www.broadinstitute.org/gatk/gatkdocs/org_broadinstitute_sting_gatk_walkers_phasing_ReadBackedPhasing.html]) to phase a vcf file.

I initially was using version 1.0.5039M but got the error message that 'variant' wasn't defined. So I tried updating to the latest version and running everything again, only to get a new error about a malformed walker argument. My command and output are below.

java -jar GenomeAnalysisTK.jar -T ReadBackedPhasing -R reference.fasta -I aligned_reads.bam --variant GATKVariantCall.vcf -L GATKVariantCall.vcf -o phased_SNPs.vcf --phaseQualityThresh 20.0

INFO  15:41:49,802 ArgumentTypeDescriptor - Dynamically determined type of GATKVariantCall.vcf to be VCF 
##### ERROR ------------------------------------------------------------------------------------------
##### ERROR A USER ERROR has occurred (version 2.4-9-g6862a2d): 
##### ERROR The invalid arguments or inputs must be corrected before the GATK can proceed
##### ERROR Please do not post this error to the GATK forum
##### ERROR
##### ERROR See the documentation (rerun with -h) for this tool to view allowable command-line arguments.
##### ERROR Visit our website and forum for extensive documentation and answers to 
##### ERROR commonly asked questions http://www.broadinstitute.org/gatk
##### ERROR
##### ERROR MESSAGE: Invalid command line: Malformed walker argument: Could not find walker with name: ReadBackedPhasing
##### ERROR ------------------------------------------------------------------------------------------

Any advice would be appreciated.

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