SolidCAM 2021 circular pocket not generated

Hello,
i just started with SolidCAM and try my first job -> attached photos..
All working toolpathes are blackish and one not working toolpath is blueish. Here i want a 6.05mm hole/4mm deep. Tool should be a 6mm end mill.
Tried many things but still don´t work.

Please help

It's the xy allowance 0.25mm , using a 6mm tool machining 6.05

Thank you very much