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[error] WorkflowManagerActor Workflow failed (during ExecutingWorkflowState): Job RNAseq.SplitNCig

Dear administrators
This is my first try to run CROMWELL + WDL. I prepare running workflows locally and followed by "(How to) Execute Workflows from the gatk-workflows Git Organization". But , a GATK RUNTIME ERROR has occurred, here is stderr:

24-0abc-44c6-9ea6-4c34cbabc084/call-SplitNCigarReads/inputs/127538202/Aligned.out.dedupped.bam -o Aligned.out.split.bam -rf ReassignOneMappingQuality -RMQF 255 -RMQT 60 -U ALLOW_N_CIGAR_READS
INFO 11:36:18,879 HelpFormatter - Executing as [email protected] on Linux 3.10.0-327.el7.x86_64 amd64; OpenJDK 64-Bit Server VM 1.8.0_111-8u111-b14-2~bpo8+1-b14.
INFO 11:36:18,879 HelpFormatter - Date/Time: 2019/05/28 11:36:18
INFO 11:36:18,879 HelpFormatter - --------------------------------------------------------------------------------
INFO 11:36:18,880 HelpFormatter - --------------------------------------------------------------------------------
INFO 11:36:19,111 GenomeAnalysisEngine - Strictness is SILENT
INFO 11:36:19,250 GenomeAnalysisEngine - Downsampling Settings: No downsampling
INFO 11:36:19,259 SAMDataSource$SAMReaders - Initializing SAMRecords in serial
INFO 11:36:19,331 SAMDataSource$SAMReaders - Done initializing BAM readers: total time 0.07
INFO 11:36:27,264 GATKRunReport - Uploaded run statistics report to AWS S3
##### ERROR ------------------------------------------------------------------------------------------
##### ERROR stack trace
java.lang.NullPointerException
at java.util.TreeMap.compare(TreeMap.java:1294)
at java.util.TreeMap.put(TreeMap.java:538)
at java.util.TreeSet.add(TreeSet.java:255)
at org.broadinstitute.gatk.utils.sam.ReadUtils.getSAMFileSamples(ReadUtils.java:70)
at org.broadinstitute.gatk.engine.samples.SampleDBBuilder.addSamplesFromSAMHeader(SampleDBBuilder.java:66)
at org.broadinstitute.gatk.engine.GenomeAnalysisEngine.initializeSampleDB(GenomeAnalysisEngine.java:846)
at org.broadinstitute.gatk.engine.GenomeAnalysisEngine.execute(GenomeAnalysisEngine.java:296)
at org.broadinstitute.gatk.engine.CommandLineExecutable.execute(CommandLineExecutable.java:121)
at org.broadinstitute.gatk.utils.commandline.CommandLineProgram.start(CommandLineProgram.java:248)
at org.broadinstitute.gatk.utils.commandline.CommandLineProgram.start(CommandLineProgram.java:155)
at org.broadinstitute.gatk.engine.CommandLineGATK.main(CommandLineGATK.java:106)
##### ERROR ------------------------------------------------------------------------------------------
##### ERROR A GATK RUNTIME ERROR has occurred (version 3.5-0-g36282e4):

[2019-05-28 19:36:30,12] [error] WorkflowManagerActor Workflow 68f8e724-0abc-44c6-9ea6-4c34cbabc084 failed (during ExecutingWorkflowState): Job RNAseq.SplitNCigarReads:NA:1 exited with return code 1 which has not been declared as a valid return code. See 'continueOnReturnCode' runtime attribute for more details.

I edit the json file and all gs:// file paths are replaced local file paths. I tried this twice as a result
Thanks for telling me what causes this problem.
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