An "update cycle" error message means that there is a loop in a family/child relationship between geometry.
CATIA V5 likes to have all the Part Body geometry sequential, with parent features positioned first in the tree, and children features positioned lower in the tree below their parents. The "update cycle" error means childred features are higher in the tree than their parents, and CATIA is unable to update the part.
This error happens alot when featues are re-ordered in the tree.
Try isolating the plane, or redefining the plane as an offset from the Axis System. Or use the Parents/Children tool to try to understand where the loop is.