'Expected One Child' error while creating new case

[praveenmaniyatt@gmail_com]

What I have done:1) Cloning the git repository: git clone https://github.com/escomp/cesm.git my_cesm_sandbox2) Ran git tag3) Ran git checkout cesm2_2_alpha02b4) Ran ./manage_externals/checkout_externals5) Ran cd my_cesm_sandbox/cime/scripts6) Ran ./create_newcase --case case1 --compset B1850 --res f09_g17_gl4Got the following output with error:Compset longname is 1850_CAM60_CLM50%BGC-CROP_CICE_POP2%ECO_MOSART_CISM2%NOEVOLVE_WW3_BGC%BDRDCompset specification file is /home/stardust/cesm/cesm-new1/my_cesm_sandbox/cime/../cime_config/config_compsets.xmlCompset forcing is 1850Com forcing is Biogeochemistry intercomponent  with diagnostic CO2ATM component is CAM cam6 physics:LND component is clm5.0:BGC (vert. resol. CN and methane) with prognostic crop:ICE component is Sea ICE (cice) model version 5OCN component is POP2 EcosystemROF component is MOSART: MOdel for Scale Adaptive River TransportGLC component is cism2 (default, higher-order, can run in parallel):cism ice evolution turned off (this is the standard configuration unless you're explicitly interested in ice evolution):WAV component is Wave WatchESP component is Pes     specification file is /home/stardust/cesm/cesm-new1/my_cesm_sandbox/cime/../cime_config/config_pes.xmlCompset specific settings: name is RUN_STARTDATE and value is 0001-01-01Compset specific settings: name is RUN_REFDATE and value is 0130-01-01Compset specific settings: name is RUN_TYPE and value is hybridCompset specific settings: name is RUN_REFCASE and value is b.e20.B1850.f09_g17.pi_control.all.297Compset specific settings: name is RUN_REFDIR and value is cesm2_initMachine is stardust-cosmosPes setting: grid match    is a%0.9x1.25.+l%0.9x1.25.+oi%gx1 Pes setting: grid          is a%0.9x1.25_l%0.9x1.25_oi%gx1v7_r%r05_g%gland4_w%ww3a_m%gx1v7 Pes setting: compset       is 1850_CAM60_CLM50%BGC-CROP_CICE_POP2%ECO_MOSART_CISM2%NOEVOLVE_WW3_BGC%BDRD Pes setting: tasks       is {'NTASKS_ATM': -8, 'NTASKS_LND': -4, 'NTASKS_ROF': -4, 'NTASKS_ICE': -4, 'NTASKS_OCN': -1, 'NTASKS_GLC': -8, 'NTASKS_WAV': -8, 'NTASKS_CPL': -8} Pes setting: threads     is {'NTHRDS_ATM': 1, 'NTHRDS_LND': 1, 'NTHRDS_ROF': 1, 'NTHRDS_ICE': 1, 'NTHRDS_OCN': 1, 'NTHRDS_GLC': 1, 'NTHRDS_WAV': 1, 'NTHRDS_CPL': 1} Pes setting: rootpe      is {'ROOTPE_ATM': 0, 'ROOTPE_LND': 0, 'ROOTPE_ROF': 0, 'ROOTPE_ICE': -4, 'ROOTPE_OCN': -8, 'ROOTPE_GLC': 0, 'ROOTPE_WAV': 0, 'ROOTPE_CPL': 0} Pes setting: pstrid      is {} Pes other settings: {}Pes comments: none Compset is: 1850_CAM60_CLM50%BGC-CROP_CICE_POP2%ECO_MOSART_CISM2%NOEVOLVE_WW3_BGC%BDRD  Grid is: a%0.9x1.25_l%0.9x1.25_oi%gx1v7_r%r05_g%gland4_w%ww3a_m%gx1v7  Components in compset are: ['cam', 'clm', 'cice', 'pop', 'mosart', 'cism', 'ww3', 'sesp', 'drv', 'dart']  This is a CESM scientifically supported compset at this resolution. Using project from config_machines.xml: vulcanUsing charge_account from config_machines.xml: vulcancesm model version found: cesm2.1-alphaBatch_system_type is slurm ERROR: Expected one child
I am running ubuntu system with gnu and intel compilers. mpirun is available.Please help me out with this error. What does 'Expected one child' error mean? Have been stuck with this for a long time. Any help is appreciated.