(no subject)

Dear lammps-users,
I want to simulate the water, but i am getting this error " ERROR: Unknown fix style (…/modify.cpp:782) "

this is the fix command that I used:
fix fShakeSPCE spce shake 0.0001 10 100 b 1 a 1

Can you help me please

Thank you so much

“These fixes are part of the RIGID package. They are only enabled if LAMMPS was built with that package. See the Making LAMMPS section for more info.”

Than you Aidan Thompson, but LAMMPS is not build with this package

can you tell me how to install this package please

Than you Aidan Thompson, but LAMMPS is not build with this package

can you tell me how to install this package please

​it is all in the documentation. check this out:​

http://lammps.sandia.gov/doc/Section_start.html#start-3