Howdy there, I got a small problem where nearly all the vehicles are able to spawn on their own, or through a trainer. But (after replacing them with new models) the fbi and polpatriot can only sometimes be spawned. When trying to spawn them through a trainer it freezes for about 30 seconds and says "Cannot spawn vehicle, check the model" but the model is fine. Any ideas?

Some possible options:

 

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Check your vehicle.ide. One line was incorrect.

 

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Then try using commandline parameters, since I don't know much about that you can google it or wait for someone else to help you with that. Usually when you want to spawn a vehicle and you get 'Unable to spawn, please check requested model' message, it means that you are starting to lose textures and commandline parameters might help you solve that problem.

 

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Go to your GTA IV folder > right click on LaunchGTAIV.exe > Properties > Compatibility and check 'Run this program as administrator', also do the same for the GTAIV.exe.

 

Thanks, I got it working.