$refractiveindexreal required setting the real part reflection index of the each layer and each lamda.It is correspond to the lamdalength and totallayer2. This number needs to be set in the beginning of input file.
Example
$refractiveindexreal
2.1 2.3
2.2 2.4
2.4 2.5
2.7 2.8
3.1 3.9