There is a problem with the Route Assembly that means the route cannot be flattened

KL 2009-05-19

I get this message alot. It is a very cordial message, butconveys no useful information. There are no errors shown in thedesign tree before I try to flatten the route, so it must besomething to do with the requirements for flattening a route.

Does anyone know what errors typically result in this message? Isthere a utility for checking the route (the check sketch tool isgrayed out)?

ThanksSolidworks Routing