To anyone who still is unsure how to fix it (if that's possible after over a year, sorry for the wait forgot my password here)
Just get a custom gameconfig, the unlimited vehicles one tends to help in gta5mods.
However, it may also be an issue in a plugin. Make sure you have all the plugins that require things like ragenativeui installed correctly and that those plugins have the correct update for their perquisites (required things like rage)
Let me know if you still have any issues, I'll try to get back to you.
If all else fails just try running "forceduty" in the f4 RagePluginHook menu. BUT do not use this in the locker room menu, just run it anywhere as long as lspdfr is loaded in the game.