Gambit error- the edge degenerates into a point
 

I am generating a simple geometry in Gambit to simulate flow in a tube in Fluent. The diameter of the tube is extremely small( in the order of microns) compared to the lenght(10E-4) These are very small dimensions. In Gambit, when trying to create an edge between the vertices, i keep getting this error, the edge degenerates into a point. Is there a physical limitation to the geometry that can be drawn using GAMBIT and if it is there can i override it somehow? Any suggestions would be appreciated. Thanks

Re: Gambit error- the edge degenerates into a poin
 

change the defaut limits