Example `orientpotential` crashes

[stestoll]

The example slowmotion/orientpotential.m crashes with the following error:

Error using foldoridist
Orientational distribution folding are not supported for grid symmetry ''.
Error in pepper (line 604)
  orifun = foldoridist(Exp.Ordering,Opt.GridSymmetry);
Error in pepper (line 154)
      [xAxis,spec_,Transitions] = pepper(Sys_,Exp,Opt);
Error in orientpotential (line 25)
[B,spcref] = pepper(Sys,Exp,Opt);