Using the technology library cdsDefTechLib is very suspicious for a layout
and looks like a set up problem. You probably are trying to create the
layout in a library which doesn't refer to the tech file of UMC 180 nm.
When you create a library, you are proposed 3 or 4 ways to associate it
with a technology library, you should probably make it reference the one in
your PDK.
Yours,
--
Jean-Marc