I attempted protonated valine using
PRES CNEU command, top_all22_prot.inp, This builds psf/pdb of protonated valine with vmd.
during the minimization, I ended up following errors,
because my par_all22-prot.inp is missing following angle parameters.
UNABLE TO FIND ANGLE PARAMETERS FOR CD CT1 CT1 (ATOMS 590 588 582)
which particular would be an optimal for this run.
appreciate your help.