Hi! I have such code in snakemake. But I am getting the following error:

RuleException in line 25 of /storage1/kaman/gatk/Snakefile: NameError: The name 'input2' is unknown in this context. Please make sure that you defined that variable. Also note that braces not used for variable access have to be escaped by repeating them, i.e. {{print $1}}

import glob

SAMPLES = glob_wildcards("input_bam/{sample}.bam")
INTERVALS = glob_wildcards("intervals/{interval}.bed")


rule all:
        input: expand("out/{sample}.AddOrReplaceReadGroups.bam", sample = SAMPLES.sample), expand("out/{sample}.MarkDuplicates.txt", sample = SAMPLES.sample), expand("out/{sample}.MarkDuplicates.bam", sample = SAMPLES.sample), expand("out_BaseRecalibrator/{sample}.BaseRecalibrator.{interval}.txt", interval=INTERVALS.interval, sample = SAMPLES.sample)

rule gatk_AddOrReplaceReadGroups:
        input: "input_bam/{sample}.bam"
        output: "out/{sample}.AddOrReplaceReadGroups.bam"
        shell: "./gatk-4.1.9.0/gatk --java-options ""-Xmx30g""  AddOrReplaceReadGroups -I {input}  -O {output} -ID group1 -SM NORMAL -PL illumina -LB lib1 -PU unit1"

rule gatk_MarkDuplicates:
        input: rules.gatk_AddOrReplaceReadGroups.output
        output: output1="out/{sample}.MarkDuplicates.bam", output2="out/{sample}.MarkDuplicates.txt"
        shell: "./gatk-4.1.9.0/gatk --java-options  ""-Xmx4g""  MarkDuplicates  -I {input}  -O {output.output1} -M {output.output2} --CREATE_INDEX true"

rule bedtools_genomecov:
        input: "input_bam/{sample}.bam"
        output: output1="out/{sample}.bedtools_genomecov.genome.covered.bed"
        shell: "bedtools genomecov -ibam -I {input} -bg > -O {output.output1}"

rule gatk_BaseRecalibrator:
        input: input1="intervals/{interval}.bed", input2="out/{sample}.MarkDuplicates.bam", input3='ref/ref.fa', input4='dbsnp/dbsnp_150.hg38.vcf.gz'
        output: "out_BaseRecalibrator/{sample}.BaseRecalibrator.{interval}.txt"
        shell: "./gatk --java-options ""-Xmx7680m""  BaseRecalibrator -L {input1} -I {input2} -O {output} -R {input3} --known-sites {input4}"

Please tell me what is the reason for the error