- From the modifier list, select "Unwrap UVW".
- Position the modifier between the skin and the mesh as below.
- Select the Unwrap UVW modifier, then expand the channel section and change the Map Channel setting to 2. (When the Channel Change warning box appears select "Abandon").
- Collapse the Unwrap UVW modifier into the mesh.
- Repeat steps 1 to 5 but this time change the Map Channel setting to 3.
- You should now be able to retry the Unwrap Car Body Action