[HELP] Firetruk and ambulance not replacing

I’m very new to FiveM server ownership and I am currently adding all my resources into the server.

I was attempting to replace the default GTA 5 fire engine (firetruk) with this one.

It started up and in the command prompt said it had started without any errors. I loaded in and attempted to spawn one in, then all of the sudden my game crashed. I took it by chance and loaded back in to spawn it a second time and got the same response as before.

I am also attempting to replace the default GTA 5 ambulance with this one.

I start up the server, it starts the resource perfectly, I press the spawn button, and game crashes.

Inside of my folders I am doing the same thing. I am creating the folder called “Ambulance” and “FEngine”. Inside of each of these folders is a stream folder (in which I placed the YTD and YFT files) and __resource.lua (which is empty).

THIS IS THE ERROR WINDOW I AM GETTING:
Physics validation failed for asset ambulance.yft.
This asset is INVALID. Please remove it, or fix the exporter used to export it.
Details: Poly 1 edge reference is invalid. It leads to vertex 65534, when there are only 12 verticles.

maybe incorrect meta data causing this issue, normally its a good idea to create addon vehicles in place of replacing ingame ones below are the EMS vehicles I have used in the past there should work right away just add to cfg file load server and spawn them in using file names.

http://www.psd-designs.com/vehicles.zip

They worked. Thank you so much!

i have the same issue and the link of wpgn is not working…