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[lammps-users] error Unknown fix style (../modify.cpp:815)
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[lammps-users] error Unknown fix style (../modify.cpp:815)


From: Paul Swain <swainpaul4@...24...>
Date: Thu, 17 Aug 2017 16:48:17 -0400

Hi,
In the latest version of lammps, is there any changes in "fix rigid" command? I 
'm using a simple "fix rigid" but getting a error that this is unknown fix style. Could anybody help me to resolve the issue. My input and tailed output is here. 

----------------Input---------------------
# define boundary conditions
fix 1 upper setforce NULL 0. NULL
fix 2 lower setforce 0. 0. NULL
fix 3 upper aveforce ${appforce} 0. 0.
fix 4 upper rigid group 1 upper

---------------output------------------------
# define boundary conditions
fix 1 upper setforce NULL 0. NULL
fix 2 lower setforce 0. 0. NULL
fix 3 upper aveforce ${appforce} 0. 0.
fix 3 upper aveforce 0.00755258989134825 0. 0.
fix 4 upper rigid group 1 upper
ERROR: Unknown fix style (../modify.cpp:815)


Thanks,
P