About fatal error/Umbrella Sampling

GROMACS version:
GROMACS modification: Yes/No
Here post your question
Ignoring obsolete mdp entry ‘title’ Ignoring obsolete mdp entry ‘optimize_fft’
What modifications should I make in the mdp files in order to not get these warnings?

Remove obsolete keywords from your .mdp file. But these are not fatal errors, they are merely advisory notes and they will not halt grompp.