If you do not like the new modded start screen and want to use others or the default, replace the start_screen.erp in _ACTIVE with the small file start_screen.erp from _Modular_Mods, else the game will endlessly trying to look for the start_screen.erp ...
I'm sorry for that issue, I did not test that simple case, but as the file is set to be loaded, it must exist - even if it is a placeholder.
As a small reparation, I have added a gift for you in the inactive mods folder (beside the replacement file) ;-)
E: Oh, I forgot to rename that file. Please rename f1_f2_rev_lights.erp to teams_f1_f2_rev_lights.erp