Thanks for the .mage file with the operation you’re trying to circle frame in MillMage, version 0.8.02.
When I try to frame both operation OR one at a time I can replicate the warning message you received. I can click yes and MillMage successfully executes a circle frame.
However, if I open your project in our release candidate for 0.9.00 of MillMage, RC4, it appears the out of bounds for circle frame error bug has already been addressed. I do not receive the out of bounds message when I use circle frame in the RC.
Can you test your file in the RC4 0.900 and let us know if you still get the warning?