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I am running bowtie2 aligner imported from public apps to align RNAseq data (imported TCGA files) to indexed B37 (imported from common reference files) but again and again I am getting following error:

Error
This task ran into a problem during execution and did not finish.
Command /opt/bowtie2-2.2.6/bowtie2 -p 8 -x GRCh37-liteHPV_Redux --un 120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004.unpairedunaligned.fastq.gz --al 120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004.unpairedaligned.fastq.gz --un-conc 120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004.pairedunaligned.fastq.gz -a --rg-id id --rg PL:Illumina_HiSeq --rg SM:TCGA-CQ-6229-01A -1 /sbgenomics/Projects/5eeeb0e9-950d-42dc-9570-2eb54cee03a5/120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004_1.fastq -2 /sbgenomics/Projects/5eeeb0e9-950d-42dc-9570-2eb54cee03a5/120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004_2.fastq -S ./120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004.sam && mv 120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004.pairedunaligned.fastq.1.gz 120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004.pairedunaligned.1.fastq.gz && mv 120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004.pairedunaligned.fastq.2.gz 120815_UNC16-SN851_0177_BD13LJACXX_AGTTCC_L004.paired_unaligned.2.fastq.gz failed with exit code 137.

Can anybody suggest what is going wrong? I searched about error 137 but didn't find proper informaiton. Someone has suggested that 137 indicates that process is killed by some other process or by someone, but I don't understand why would that happen?

Thanking you

Pratik