Using luac file on Nginx

Question

I have been experimenting with using Lua in Nginx - quite a neat little capability which I can use effectively. However, one of my concerns relates to IP protection so I thought I would use an online tool to compile my, fully tested, LUA script. I tried https://luac.mtasa.com/.

I uploaded the file to my server, changed by /etc/nginx/sites-available/default file to use the luac* instead of the orginal lua and reloaded nginx. However, when I attempt to browse to the resource that is being serviced by that lua(c) I get the error log message *70 failed to load external Lua file... : bad byte code header. How should this be interpreted? The options are

• That particular online compiler is not generating a valid luac.
• The nginx/lua combo does not understand that particular luac.

I should mention that I am using Nginx 1.6.2 on Ubuntu 14.10 (64 bit). I installed Lua enabled Nginix via apt-get install nginx-extras.

I am a beginner here.