Problem with defect in PC slab

Hi mpb group.

My name is Bernardo and i am a user of MPB program. I have been using 
MPB for a couple of days, and i ran the examples in the tutorial and 
program. Now doing my own examples  I am stuck trying to compute the 
defect modes in a photonic crystal slab triangular lattice. 

What i am trying to do is to compute the defect modes of a triangular 
lattice Photonic slab of air holes with a linear defect, but what i get 
doues not make sense. I think what i am doing wrong is difining the k 
path, but i am not sure. Another mistake could be in building the 
defect in the structure. If any of the mpb-discuss list can give me a 
hand with this problem i would really appreciate.

Thanks
Bernardo