Hi Saket,
This is an error message sent by Guile because (meep-fields-solve-cw fields tol maxiters L) is not called properly. For example, this message appears if maxiters has type double instead of integer. See http://ab-initio.mit.edu/wiki/index.php/Meep_Reference#Frequency-domain_so lver for more information about these parameters. Damien
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