Hello cheerful bioinformaticians :)

I have a problem about GATK SelectVariant tool. I have a VCF file including many samples. I want to separate certain samples into the different files.

I have download GATK (GenomeAnalysisTK.jar), and I have used following command,

My variants are like 14-254,14-345.... so I have written 14-282.141202 instead of SAMPLE_A_PARC

Select two samples out of a VCF with many samples:
 java -Xmx2g -jar GenomeAnalysisTK.jar \
   -R ref.fasta \
   -T SelectVariants \
   --variant input.vcf \
   -o output.vcf \
   -sn SAMPLE_A_PARC \
   -sn SAMPLE_B_ACTG

But I have received this error message

##### ERROR A USER ERROR has occurred (version 3.3-0-g37228af):
##### ERROR
##### ERROR This means that one or more arguments or inputs in your command are                                                                                         incorrect.
##### ERROR The error message below tells you what is the problem.
##### ERROR
##### ERROR If the problem is an invalid argument, please check the online docum                                                                                        entation guide
##### ERROR (or rerun your command with --help) to view allowable command-line a                                                                                        rguments for this tool.
##### ERROR
##### ERROR Visit our website and forum for extensive documentation and answers                                                                                         to
##### ERROR commonly asked questions http://www.broadinstitute.org/gatk
##### ERROR
##### ERROR Please do NOT post this error to the GATK forum unless you have real                                                                                        ly tried to fix it yourself.
##### ERROR
##### ERROR MESSAGE: Invalid argument value 'R' at position 0.
##### ERROR Invalid argument value 'ref.fasta' at position 1.
##### ERROR Invalid argument value 'T' at position 2.
##### ERROR Invalid argument value 'SelectVariants' at position 3.
##### ERROR Invalid argument value 'TR-ETM-59.vcf' at position 6.
##### ERROR Invalid argument value 'sn' at position 7.
##### ERROR Invalid argument value '14-282.141202' at position 8.
##### ERROR --------------------------------------------------------------------

Thanks and have a nice bioinformatics !!!! :)