Hi, I made two circles at different levels parallel to the Top plane. Then, on the Front plane, I created a Centerline that passes through the center of the circles. Moreover, I made a spline that has both ends pierced to the two circles. When I tried to use Mirror Entitles for SW to automatically create a spline on the other side, SW gave me an "Invalid Solution Founded" with the mirrored spline showing in red. At the bottom right of the screen, it states "The sketch has not been updated because solving it would result in invalid geometry (such as a zero-length line). Consider: o Deleting the invalid geometry. o Changing relations or dimensions to eliminate the invalid geometry." Strangely speaking, the two Pierce relations and some Coincident relations are not copied. Please let me know what I can do to resolve this issue?