That is code, and it is quite interesting that a game was developed with Lua. Lua is an interpreter, not that different than Basic. No serious games are written with Lua, though I've seen games allow macroing through Lua, that is about it. The interesting part is the error is showing a C++ code. Lua is built from C++, though it does allow you to call C++ from within the code, which must be what is going on.
Anyways, as said above, that is something the developer has to fix, you can't.