RSoft Waveguide Propagation Fix

I have an ultrafast-laser–written waveguide already modelled in RSoft (the .dat structure file is ready), yet every attempt to launch light through it in BeamPROP ends with complete loss of signal. I need... (Budget: $30 - $250 AUD, Jobs: Data Analysis, Finite Element Analysis, Matlab and Mathematica, Optical Engineering, Signal Processing)