# Migrate vehicle project from 4.26 to 5.1

**URL:** <https://forums.unrealengine.com/t/migrate-vehicle-project-from-4-26-to-5-1/757482>\
**Category:** Platform & Builds\
**Tags:** vehicle, migrate, unreal-engine, Blueprint, question\
**Created:** [January 26, 2023, 4:25pm UTC](https://forums.unrealengine.com/t/migrate-vehicle-project-from-4-26-to-5-1/757482 "2023-01-26T16:25:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nobodysproduction](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@nobodysproduction](https://forums.unrealengine.com/u/nobodysproduction)\
**Post date:** [January 26, 2023, 4:25pm UTC](https://forums.unrealengine.com/t/migrate-vehicle-project-from-4-26-to-5-1/757482/1 "2023-01-26T16:25:03Z")

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Hi everyone

I’m trying to migrate a project that is using he Traffic Vehicle System plugin. The plugin uses the vehicle system from UE. All my cars are based on this. I initially created the project in UE4.26. After migrating to 5.1 it says that it cannot find the outer class, which is the vehicle class from UE4.26. I have activated the chaos vehicle plugin in UE5.1 and cloned it afterwards. Still - the same error.

Is there a solution or is the new vehicle system just too different? If so, can the system from UE4.26 be migratet to 5.1 and get it working?

Thanks to all!