I followed the steps in the plasmonic wire grating tutorial for COMSOL 4.2. When I try to compute the results it says it has encountered a problem with stationary solver 1(sol1/s1) and Failed to evaluate variable jacobian. I took a look at my variable files and comsol says that emw.k0 is an unknown variable. The tutorial says to use this variable to define ka. How do i get comsol to recognize what emw.k0 is. Also what is emw.k0, the tutorial didn't explain what it was.
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