[xkingreaperx3]

ok so i joined single player and then i messed with the photon and some other stuff and then i cloesed garrys mod to join your server and the regulaur cop car is a error and the top of the tahoa like lighbar is a error and when people turn their lights on it come out all pruple and black and the sirens are silent (Speacial Note) I Have All The Content Packs Installed 

[PaulB]

Have you tried to restart your game then join?

[xkingreaperx3]

yes sir i restarted my pc

[Nudel]

Check if you have every content and if its still not working, download the Tahoe and the Taurus via the workshop with all things which are needed.