Problem with geometric pattern failing

Hello everyone, it's the first tutorial with Creo Parametric 5, for the exact I'm following this :

https://www.youtube.com/watch?v=8MrhiuYEoIQ

I can successfully do only the first pattert  with reference to the axis and using the original non-mirrored rib  feature
I always failed the pattern  of mirrored speck, and n the wireframe preview that shows me when I failed,  the last element of the pattern  mysteriously it is not displayed (  it should be 7 and not 6. in pattern setting  I put elements 7 and angle 360/7)
Thanks so much