Help this showed up i have no idea what to do

ON_Brep.m_T[56] 2d curve is not inside surface domain.
Rhino polysurface object is valid.
Saw that no idea what it means And if its bad or good. Or how too make it go away,

also, i just noticed it started sayying not valid. when i check it. it wasn’t sayying that before.

Hello - use ExtractBadSrf to find the problem surface and then I would Untrim it, and re-trim with the surrounding surface edges. Feel free to export the bad object to a new file and post it here or send to with a link back to this topic in your comments.