Running source code - user-defined modules imported with 'require' not found

[Crista23]

When trying to train an encoder decoder model with attention by calling the script experiments/wikilarge/encdeca/train.sh, I get the error message: "module 'shortcut' not found:No LuaRocks module found for shortcut", although this file does exists in utils/shortcut.lua. Do I need to compile anything in advance such that require('shortcut') and other modules will work?