As far as I've understood, it just means that the meshing algorithm was trying with a too big element size for the edge length. h refers to the element size as "h-refinement" is the name used for improving analysis accuracy by increasing mesh density.
The meshing algorithms that are used in Mecway don't do defeaturing, so they can't ignore a small fillet or edge if it exist in the STEP file. In case it causes the meshing to fail consistently, you will have to find a way to edit the geometry to not have such small edge lengths.
Sometimes, the mesher will just end up with a region of very fine mesh and sometimes a usable mesh is obtained without it by setting a minimum element size but other times, the meshing algorithm is not able to make a mesh if there are too small features in the geometry STEP file.
Comments
The meshing algorithms that are used in Mecway don't do defeaturing, so they can't ignore a small fillet or edge if it exist in the STEP file. In case it causes the meshing to fail consistently, you will have to find a way to edit the geometry to not have such small edge lengths.
Sometimes, the mesher will just end up with a region of very fine mesh and sometimes a usable mesh is obtained without it by setting a minimum element size but other times, the meshing algorithm is not able to make a mesh if there are too small features in the geometry STEP file.