lua_call(S, 0, 0) won't work (attempted to call a string value)?

Question

So, I wanted to go ahead and add Lua scripting to my C++ game engine, however I can't seem to do it.

I'm watching a video and i have checked out the tiny bit of code and I can't see what I'm doing wrong.

#include <Lua Source\lua.hpp>

lua_State* S = luaL_newstate();
luaL_openlibs(S);

luaL_loadfile(S, "main.lua");
lua_call(S, 0, 0);

The Lua source codes and files are all in my project folder, except for 2 cpp files which were main function (deleted those).

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And my Lua file looks like this : (and is placed where the Lua source code is.)

print("Hello World")

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The error I get looks like this :

In console :

PANIC : unprotected error in call to Lua API (attempt to call a string value)

This is what the error box that comes up looks like :

(Buttons form left to right : Cancel, Try Again, Ignore)

Error Box Link

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Edits :

My code now looks like this, adding the puts(lua_tostring(S, -1)); generated a error message :

cannot open main.lua: no such file or directory

Code

lua_State* S = luaL_newstate();
luaL_openlibs(S);
luaL_loadfile(S, "main.lua");
puts(lua_tostring(S, -1));
lua_call(S, 0, 0);

And my project files like this :

Image of project files

Answer 1

Turns out I just misunderstood a tutorial.

Thought he meant that the lua scripts run out of lua's own source code folder...

But, it runs out of your project working directory.

Answer 2

attempt to call a string value is triggered by lua_call and most probably means that luaL_loadfile returned non-zero and left an error message on the stack.

Check the return code of luaL_loadfile.

Also, add puts(lua_tostring(S,-1)); after calling luaL_loadfile.