Package a game : Shadowing error...

Hello, when i try to pack my game it fail with this error

PackagingResults: Error: Member variable declaration: ‘MaxSpeed’ cannot be defined in ‘FloatingPawnMovement’ as it is already defined in scope ‘Class /Script/Engine.FloatingPawnMovement’ (shadowing is not allowed)

I don’t understant it as i don’t use float pawn and i never touched or created a maxspeed somewhere…

Can you help me ?