The steady state file is not Dynare code, but Matlab code. That’s why model-local variables (#) do not work there. Similarly
exp(L_r) = 1 - omega ;
is not a proper Matlab assignment. You would need
L_r =log(1 - omega);
Generally, I cannot recommend full exp()-substitution as it creates a lot of problems that can be circumvented. See Question about understanding irfs in dynare