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Baserecalibrator warn : index dictionary utils

Hi! Everyone!
I have a question.
I have analysed 60 WGS files, and used GRCh38 reference genome from broadinstitute.
I have been doing Baserecalibration using dbsnp_146.hg38.vcf.gz and Mills_and_1000G_gold_standard.indels.hg38.vcf.gz as knowsite.
But I recieved warning : IndexDictionaryUtils - Track knownSites doesn't have a sequence dictionary built in, skipping dictionary validation.
I have each tabix file, and my gatk version is 3.7.0.
does it mean tabix file is bad , and I need make a dict file?
Or can I skip this warning?
please teach me how to solve this problem.

thakns

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