As the title states my game is crashing on startup and I’ve reinstalled every and tried without mods enabled and the only error I’ve found is command line option “full screen” is specified twice I don’t know what that means or how to fix it any help would be appreciated 

Hey, so this happened to me too when I first started basically your gonna wanna make sure no mods are added all the correct files from GTAV and LSPDFR are all there including RPH your gonna wanna click on RPH as then next to the stop button hit the setting icon then go to game settings and scroll over down to "Force Windowed mode" and turn that on and nothing else this helped me sometimes and if that doesn't work then under the plugins make it that you have to load LSPDFR manually using "loadplugin LSPD first response" on the RPH ui and you might have to change your window mode in the game evreytime you load into it but after awhile it just becomes habit hope that works mate!