Engine converter corrupts files [file recovery?]

I have been having issues when I try and send people cars, they have been getting these two errors,
tolua++ dbcall failed!: [string "--client\functional\CarView.lua..."]:2781: attempt to index local 'headLightInfo' (a nil value)
and
tolua++ dbcall failed !: [string '--client\functional\PlatformDesignerWindowDel..."]:1334: attempt to index (a nil value)
I have sent 'blank' cars with no headlights or fixtures and no areo and these errors still occur, then I will rebuild the exact car and it will work. I'm not sure whether is an error on my end, a problem with my files or a just a glitch of some sort. I am able to send the engines used in the cars just fine, so i think the problem has something to do with the model, I have no idea. Sometimes I can't even open up some of my own cars in Sandbox mode.
When I hosted my 'clunker' competition over 40 people were able to download and use that car, I haven't done anything different since, except download a couple mods. I did a complete un-install and re-install and then re downloaded the mods and am still getting the errors.
tolua++ dbcall failed!: [string "--client\functional\CarView.lua..."]:2781: attempt to index local 'headLightInfo' (a nil value)
and
tolua++ dbcall failed !: [string '--client\functional\PlatformDesignerWindowDel..."]:1334: attempt to index (a nil value)
I have sent 'blank' cars with no headlights or fixtures and no areo and these errors still occur, then I will rebuild the exact car and it will work. I'm not sure whether is an error on my end, a problem with my files or a just a glitch of some sort. I am able to send the engines used in the cars just fine, so i think the problem has something to do with the model, I have no idea. Sometimes I can't even open up some of my own cars in Sandbox mode.
When I hosted my 'clunker' competition over 40 people were able to download and use that car, I haven't done anything different since, except download a couple mods. I did a complete un-install and re-install and then re downloaded the mods and am still getting the errors.