Debugging using "print" is okay, but it's not productive or efficient. This is why I like to use the debugger.

But, when I install packages using LuaRocks the debugger can't find the path to the "lua_modules" folder.

If you also have this problem, you can add the code below to the first line of your main file.

local LUA_PATH = 'my LUA_PATH from "$ luarocks path"'
local LUA_CPATH = 'my LUA_CPATH from "$ luarocks path"'

package.path = package.path .. ';' .. LUA_PATH
package.cpath = package.cpath .. ';' .. LUA_CPATH

I hope you found this post helpful.
If you have any questions, please feel free to leave a comment.