Hi , the error is as follow:

Error executing process > 'BigWig (group1_R1)'

Caused by:
Process BigWig (group1_R1) terminated with an error exit status (2)

Command executed:

SCALE_FACTOR=$(grep 'mapped (' group1_R1.mLb.clN.sorted.bam.flagstat | awk '{print 1000000/$1}')
echo $SCALE_FACTOR > group1_R1.mLb.clN.scale_factor.txt
genomeCoverageBed -ibam group1_R1.mLb.clN.sorted.bam -bg -scale $SCALE_FACTOR -pc | sort -k1,1 -k2,2n > group1_R1.mLb.clN.bedGraph

bedGraphToBigWig group1_R1.mLb.clN.bedGraph genome.fa.sizes group1_R1.mLb.clN.bigWig

find * -type f -name "*.bigWig" -exec echo -e "bwa/mergedLibrary/bigwig/"{}"\t0,0,178" ; > group1_R1.mLb.clN.bigWig.igv.txt

Command exit status:
2

Command output:
(empty)

Command error:
sort: cannot create temporary file in '': Read-only file system