Well, this is embarrassing. I used the "ULX Respawn" addon as a reference to make this, because I was unsure of how the command system worked.
I forgot to rename the function.. I changed the name of it in the non-SVN version, but not the SVN version.
I'll re-upload it with the function name changed. Anyway, thanks for pointing that out.
Edit: Done.
Edit 2: I noticed my command doesn't show up in the autocomplete for the 'ulx' command.
I've compared, and it seems I have mine formatted exactly like the commands in fun.lua.
I can't seem to find what's adding those commands to the autocomplete. How do I add mine?