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1. Change of directory to that folder (i.e. GUI/ from the downloaded or cloned folder)
2. The following "neutron-producing"/"neutron source" modules, will in the current version not produce any data when used from within the Vitess GUI:
   • ESS_butterfly
   • ESS_butterfly_mcpl
   • MCPL_input
   Please instead use the Vitess feature of File→ Export As to save a shell script or batch file, which you can afterwards execute from the command line. 
   On MacOS and Linux
   • Save an sh shell script e.g. Untitled.sh
   • Give execute permission to the shell script by e.g. chmod u+x Untitled.sh
   • Execute by ./Untitled.sh
   On Windows
   
   • Save a bat file, e.g. Untitled.bat
   • Browse to the folder where the bat file is located
   • Double-click the bat file
3. Please always specify a full path for the MCPL file when using the MCPL Input/Output modules
4. When using the ESS_butterfly_MCPL module, please place the relevant beamport MCPL file from http://public.esss.dk/users/willend/MCPL/ in the simulation folder
   
   

It may also be relevant to look at the presentation below: