Source files in subfolders

Hi. I’m having some trouble with an Android build. I have a file in a subfolder utils called fontmanager.lua

I get it with

fm = require("utils.fontmanager")

and then do something with fm. This works fine and dandy on the simulator, but when I run it on an Android tablet it comes up with

V/Corona  ( 3692): \> Class.forName: system.fontmanager.LuaLoader V/Corona  ( 3692): WARNING: Could not load 'LuaLoader' I/Corona  ( 3692): Runtime error I/Corona  ( 3692): module 'system.fontmanager' not found:resource (system.fontmanager.lu) does not exist in archive I/Corona  ( 3692): no field package.preload['system.fontmanager'] I/Corona  ( 3692): no file '(null)/system.fontmanager.lua' I/Corona  ( 3692): no file '(null)/system.fontmanager.lua' I/Corona  ( 3692): no file '/data/app-lib/uk.org.robsons.paul.Font\_Manager-1/libsystem.fontmanager.so' I/Corona  ( 3692): no file './system.fontmanager.so' I/Corona  ( 3692): no file '(null)/system.fontmanager.so' I/Corona  ( 3692): no file '/data/app-lib/uk.org.robsons.paul.Font\_Manager-1/libsystem.so' I/Corona  ( 3692): no file './system.so' I/Corona  ( 3692): no file '(null)/system.so' I/Corona  ( 3692): stack traceback: I/Corona  ( 3692): [C]: in function 'require' I/Corona  ( 3692): ?: in function 'require' I/Corona  ( 3692): /Users/paulrobson/Corona/Font Manager/main.lua:9: in main

on the log, i.e. it can’t find the file, it doesn’t load, nothing ever gets started. 

 

What am I doing wrong? Do I have to specify it as a plugin ?  

 

I think this was solved in another post.  Was it a case sensitivity problem?

I think this was solved in another post.  Was it a case sensitivity problem?