I can install addon cars without any problem and I have also installed few addon planes too. But now whenever I try to install any addon plane only plane my game crashes why? Can anybody help?

Hey everyone I am encountering an issue
I recently installed 350z addon and when i opened the game the loading screen got stuck on 2nd picture but the loading story mode slider is moving. I uninstalled 350z mod but still it was not working. I reinstalled at first it worked but after that it stopped working. I again reinstalled and now is gets stuck on 2nd or 3rd loading screen plz help

Hello folks hope you are having an amazing day i have a problem in gta 5 ls customs are not working whenever i go to one of them door wont open and by using menyoo spawner i look inside the dude is not there but the songs are playing kindly please help me and my gta 5 is heavily modded.ty