so i recently installed the game previously and when i played on the marseille route the game crashed with this error
Why are you telling us instead of DTG? The Marseille route is a DTG Product and they can tell you what you need to do. And did you run LogMate as suggested to you in other posts? No - what a surprise
If you can tell us as much information as possible and details on Locomotive, service, route and where it was on the route, can have a look into it.
Try reading your first post where you talk about a problem on the Marseille route - which is why DTG will look at it. They won't have any info about third party routes