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I'm trying to run a snakefile for the first time with limited coding experience using salmon to index a reference genome. I'm not too sure what I'm doing wrong based on this error message.

Error: Building DAG of jobs...
MissingRuleException:
No rule to produce snakefile (if you use input functions make sure that they don't raise unexpected exceptions).

Code:

rule salmon_index:
        input:
                R1="sequences/*R1.fastq.gz",
                R2="sequences/*R2.fastq.gz"
        output:
                Index="results/salmon_index"
        shell:
                """
                salmon index --threads 8 -t references/genome.fa.gz -i salmon_index
                """
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