ok then you are close. Are you still getting the same error message? If that's the case let's try to bypass it. Open gmshplanet.m
and comment out lines 53-55:
if ~ismember([3,4],gmshmajorversion),
error(['gmshplanet: Gmsh major version ' gmshmajorversion ' not supported!']);
end
and we will see if a mesh is created.
Mathieu