Zmodeler mirror error

[Underscoree]

Hello, I’m wondering if anyone can help me. I have been editing a vehicle inside of blender and just added a simple body kit onto it, i then used the mirror tool to make the body kit appear on both sides. When exporting to zmodeler the mirror function doesn’t work and only half of the car has the body kit and the other half is stock. I created the body kit by extending the arches of the base model. If anyone can help me or tell me how to fix this that would be great.

Thank you

[Underscoree]

Update: fixed my error

[Oleg]

in case someone wonders what's the issue is, the mirror tool has options in expand window: the "Mirror geometry" should be toggled on, the "mirror axes" should be toggled off.