Hi Enrico,

I am no FORTRAN 90 expert but based on the error it looked to me like the compiler was not finding the file.

Guessed this might be due to some sort of include path setting (just like C and C++) a quick search on that topic came up with this hit:

https://gcc.gnu.org/onlinedocs/gfortran ...

Hi Jussi,

Thanks for your reply.
I figured out the same but don't know how to solve it.
Could you please tell me how I should modify the code?

Thanks!
Enrico

Hello all,
I'm relatively new to Fortran 90 and I'm encountering several problems with
the following code.

program hfss_main

!-------------------------------------------------------------------------------
! -- Use association --
use derived_data_types
use output
use ray_visual_module
use randdp ...