REQUIRED for all errors and issues:
a) GATK version used:
b) Exact command used:
c) Entire program log:

USAGE: IndexFeatureFile [arguments]

Creates an index for a feature file, e.g. VCF or BED file.
Version:4.2.6.1

Required Arguments:

--input,-I <GATKPath>         Feature file (eg., VCF or BED file) to index. Must be in a tribble-supported format
                              Required.

Optional Arguments:

--arguments_file <File>       read one or more arguments files and add them to the command line  This argument may be
                              specified 0 or more times. Default value: null.

--gatk-config-file <String>   A configuration file to use with the GATK.  Default value: null.

--gcs-max-retries,-gcs-retries <Integer>
                              If the GCS bucket channel errors out, how many times it will attempt to re-initiate the
                              connection  Default value: 20.

--gcs-project-for-requester-pays <String>
                              Project to bill when accessing "requester pays" buckets. If unset, these buckets cannot be
                              accessed.  User must have storage.buckets.get permission on the bucket being accessed.
                              Default value: .

--help,-h <Boolean>           display the help message  Default value: false. Possible values: {true, false}

--output,-O <GATKPath>        The output index file. If missing, the tool will create an index file in the same
                              directory as the input file.  Default value: null.

--QUIET <Boolean>             Whether to suppress job-summary info on System.err.  Default value: false. Possible
                              values: {true, false}

--tmp-dir <GATKPath>          Temp directory to use.  Default value: null.

--use-jdk-deflater,-jdk-deflater <Boolean>
                              Whether to use the JdkDeflater (as opposed to IntelDeflater)  Default value: false.
                              Possible values: {true, false}

--use-jdk-inflater,-jdk-inflater <Boolean>
                              Whether to use the JdkInflater (as opposed to IntelInflater)  Default value: false.
                              Possible values: {true, false}

--verbosity <LogLevel>        Control verbosity of logging.  Default value: INFO. Possible values: {ERROR, WARNING,
                              INFO, DEBUG}

--version <Boolean>           display the version number for this tool  Default value: false. Possible values: {true,
                              false}

Advanced Arguments:

--showHidden <Boolean>        display hidden arguments  Default value: false. Possible values: {true, false}

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A USER ERROR has occurred: -F is not a recognized option

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So I am currently trying to index a vcf file I have filtered so there will be only chromosome 10 present in this vcf file. I succeeded in the first part and now only have a vcf file with chromosome 10. To use this VCF file in other GATK functions I apparently need to index it using the bundled tool IndexFeatureFile. Looking at this link: https://gatk.broadinstitute.org/hc/en-us/articles/360037428111-IndexFeatureFile it seemed quite easy, however, whilst copying the command with my file it just doesn't want to recognize the -F, I also tried -f. Do you guys perhaps know why it doesn't recognize the -F flag?