gatk VariantRecalibrator positional argument error

I’m trying to use recalibrate my vcf using gatk VariantRecalibrator, but keep getting an error “Illegal argument value: Positional arguments were provided”. But I don’t know what this means, or how to correct it!

Here’s my call:

gatk VariantRecalibrator 
   -R "/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/Homo_sapiens_assembly38.fasta" 
   -V "$OUT"/results/variants/"$SN".norm.vcf.gz 
   -AS 
   --resource hapmap,known=false,training=true,truth=true,prior=15.0: "/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/hapmap_3.3.hg38.vcf.gz" 
   --resource omni,known=false,training=true,truth=false,prior=12.0: "/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/1000G_omni2.5.hg38.vcf.gz" 
   --resource 1000G,known=false,training=true,truth=false,prior=10.0: "/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/1000G_phase1.snps.high_confidence.hg38.vcf.gz" 
   --resource dbsnp,known=true,training=false,truth=false,prior=2.0: "/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/Homo_sapiens_assembly38.dbsnp138.vcf" 
   -an QD -an MQ -an MQRankSum -an ReadPosRankSum -an FS -an SOR 
   -mode SNP 
   -O "$OUT"/results/variants/"$SN".norm.vcf.gz.output.AS.recal 
   --tranches-file "$OUT"/results/variants/"$SN".norm.vcf.gz.output.AS.tranches 
   --rscript-file "$OUT"/results/variants/"$SN".norm.vcf.gz.output.plots.AS.R

And the error I see:

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A USER ERROR has occurred: Illegal argument value: Positional arguments were provided ',/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/hapmap_3.3.hg38.vcf.gz{/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/1000G_omni2.5.hg38.vcf.gz{/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/1000G_phase1.snps.high_confidence.hg38.vcf.gz{/Volumes/Seagate Expansion Drive/refs/hg38/gatk download/Homo_sapiens_assembly38.dbsnp138.vcf}' but no positional argument is defined for this tool.

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I’ve read the manual and tried googling, but can’t see how to avoid,
Any help much appreciated!

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