I'm not so sure, LSPDFR is the only mod I've ever installed - the warning dialogue from Rockstar states that unauthorised mods will affect ability to access online.
From there on the game will not start at all, unless the mod has been removed from the directory. It was working absolutely fine a couple of hours ago - I'd only shut the PC down to grab some dinner, and came back to these errors. Not sure whether Rockstar had released a patch has been released or not?