easy rendering for Rhino in Windows
This looks like a .Net problem. When does this error come up? Can you keep rendering after this problem pops up?
Did this show up?
Rendering is not possible after this message occurs. The error seems to appear at any time after the file is opened (when nxt is run) and after a successful render.
This is a problem with the Rhino license manager that Flamingo is attempting to communicate with when rendering. Flamingo validates it license key prior to rendering and the Rhino license manager is having a problem when authenticating the license key. If you look at the "Technical Support" section of this WIKI page and follow the "Rhino 5" instructions it should take care of your problem.