MESSAGE: Code exception (see stack trace for error itself)

Hi all,
I meet some error while call variant with HaplotypeCaller, please help~~ Thanks a lot!
my CMD:
java -Xmx20g -jar GenomeAnalysisTK-3.6.jar -T HaplotypeCaller -R /human_g1k_v37_decoy.fasta -I Human_9.final.bam -nct 4 -ERC GVCF -o Human_9.GATK.var.g.vcf

the ERROR:
WARN 18:07:03,362 HaplotypeCallerGenotypingEngine - location 3:172459286: too many alternative alleles found (7) larger than the maxi
INFO 18:07:48,028 ProgressMeter - 3:176076605 4.92449994E8 2.8 h 20.0 s 21.3% 13.3 h 10.5 h
WARN 18:08:31,543 HaplotypeCallerGenotypingEngine - location 3:179515377-179515384: too many alternative alleles found (7) larger tha
WARN 18:08:47,882 HaplotypeCallerGenotypingEngine - location 3:181236097: too many alternative alleles found (7) larger than the maxi
INFO 18:08:48,029 ProgressMeter - 3:181255828 4.92449994E8 2.9 h 20.0 s 21.5% 13.3 h 10.4 h
INFO 18:09:48,031 ProgressMeter - 3:185512628 4.92449994E8 2.9 h 21.0 s 21.7% 13.3 h 10.4 h
INFO 18:10:48,032 ProgressMeter - 3:189857581 4.92449994E8 2.9 h 21.0 s 21.8% 13.3 h 10.4 h
WARN 18:11:16,309 HaplotypeCallerGenotypingEngine - location 3:191697932: too many alternative alleles found (7) larger than the maxi
WARN 18:11:18,370 HaplotypeCallerGenotypingEngine - location 3:191780770: too many alternative alleles found (12) larger than the max

ERROR --

ERROR stack trace

java.util.NoSuchElementException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1431)
at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
at org.broadinstitute.gatk.tools.walkers.haplotypecaller.HaplotypeCallerGenotypingEngine.reduceNumberOfAlternativeAllelesBased
at org.broadinstitute.gatk.tools.walkers.haplotypecaller.HaplotypeCallerGenotypingEngine.assignGenotypeLikelihoods(HaplotypeCa
at org.broadinstitute.gatk.tools.walkers.haplotypecaller.HaplotypeCaller.map(HaplotypeCaller.java:964)
at org.broadinstitute.gatk.tools.walkers.haplotypecaller.HaplotypeCaller.map(HaplotypeCaller.java:251)
at org.broadinstitute.gatk.engine.traversals.TraverseActiveRegions$TraverseActiveRegionMap.apply(TraverseActiveRegions.java:70
at org.broadinstitute.gatk.engine.traversals.TraverseActiveRegions$TraverseActiveRegionMap.apply(TraverseActiveRegions.java:70
at org.broadinstitute.gatk.utils.nanoScheduler.NanoScheduler$ReadMapReduceJob.run(NanoScheduler.java:471)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

ERROR ------------------------------------------------------------------------------------------

ERROR A GATK RUNTIME ERROR has occurred (version 3.6-0-g89b7209):

ERROR

ERROR This might be a bug. Please check the documentation guide to see if this is a known problem.

ERROR If not, please post the error message, with stack trace, to the GATK forum.

ERROR Visit our website and forum for extensive documentation and answers to

ERROR commonly asked questions https://www.broadinstitute.org/gatk

ERROR

ERROR MESSAGE: Code exception (see stack trace for error itself)

ERROR ------------------------------------------------------------------------------------------