Mesh Leak in Complex Tiny Structures (HFSS)

I am trying to simulate a pretty complex tiny structure (max dimension 1mm) fed with a rectangular waveguide. I have simulated one similar to this before with no problems but this one keeps kicking out a mesh leak error. I read through the only other post on the web about this error but all the fixes don't seem to be helping me. Can anyone describe exactly what this means? Or help me?

-Lee

I have solved my own problem. The issue was that there were indeed holes in the mesh. I solved this by selecting the face of the complex structure, creating an object from the face, then sweeping along a vector to recreate a solid object with no holes. Hope this helps anyone in the future.

-Lee