Default implicit solvent fails with GROMACS 2018 about dynamics HOT 1 OPEN

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GROMACS:      gmx mdrun, version 2018
Executable:   /home/makson/Publiczny/Dynamics/gromacs/gromacs-2018/install/bin//gmx
Data prefix:  /home/makson/Publiczny/Dynamics/gromacs/gromacs-2018/install
Working dir:  /home/makson/.dynamics/cpeptide_test/test
Command line:
  gmx mdrun -nice 4 -s cpeptide_em -o cpeptide_em -c cpeptide_b4pr -v -ntmpi 1


Back Off! I just backed up md.log to ./#md.log.1#
Reading file cpeptide_em.tpr, VERSION 2018 (single precision)
No option -multi
Using 1 MPI thread


NOTE: This file uses the deprecated 'group' cutoff_scheme. This will be
removed in a future release when 'verlet' supports all interaction forms.


Back Off! I just backed up cpeptide_em.trr to ./#cpeptide_em.trr.1#

Back Off! I just backed up ener.edr to ./#ener.edr.1#

Steepest Descents:
   Tolerance (Fmax)   =  1.00000e+03
   Number of steps    =        10000

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Program:     gmx mdrun, version 2018
Source file: src/gromacs/gmxlib/nonbonded/nb_generic.cpp (line 298)

Fatal error:
Death & horror! GB generic interaction not implemented.

For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors
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...
GROMACS:      gmx mdrun, version 2018
Executable:   /home/makson/Publiczny/Dynamics/gromacs/gromacs-2018/install/bin//gmx
Data prefix:  /home/makson/Publiczny/Dynamics/gromacs/gromacs-2018/install
Working dir:  /home/makson/.dynamics/cpeptide_test/test
Command line:
  gmx mdrun -nice 4 -s cpeptide_em -o cpeptide_em -c cpeptide_b4pr -v


Back Off! I just backed up md.log to ./#md.log.2#
Reading file cpeptide_em.tpr, VERSION 2018 (single precision)

NOTE: Parallelization is limited by the small number of atoms,
      only starting 2 thread-MPI ranks.
      You can use the -nt and/or -ntmpi option to optimize the number of threads.


NOTE: disabling dynamic load balancing as it is only supported with dynamics, not with integrator 'steep'.