CENTERLINE FROM A TUBE BODY

[CAD2015]

Hi,

I was trying to create a centerline from a tube body.
I got the error message in the second picture.
My main task is to measure the centerline of this tube body.
I use NX 2212.
How could I fix this matter?

Thank you!

 

[cowski]

Is this an imported body (STEP or similar)? If so, try using "optimize face" on the geometry before using it for anything else.