How to print Error Messages? I am not getting any.

[theanimatorspal]

I am using Sol3, and have the following structure in my lua Program

function load()
end
function draw()
end
function update()
end

It is similar to Love2D, however the error messages are not being even printed, suppose I call a non existing function in load(), that will be called later by the executable, it lets it happen.

This is what I have for handling in C++, l is sol::state.

    sol::protected_function draw_callback = l["Draw"];
    sol::protected_function load_callback = l["Load"];
    sol::protected_function event_callback = l["Event"];
    sol::protected_function disptach_callback = l["Dispatch"];
    sol::protected_function update_callback = l["Update"];

    auto SafeCall = [](sol::protected_function& infunc) {
        auto result = infunc();
        if (not infunc.valid()) {
            sol::error err = result;
            std::string what = err.what();
            std::cout << what << std::endl;
            exit(EXIT_FAILURE);
        }
    };

    auto Event = [&](void*) { event_callback(); };
    em.SetEventCallBack(Event);
    auto Draw = [&](void* data) {
        SafeCall(draw_callback);
    };
    w.SetDrawCallBack(Draw);
    auto Update = [&](void* data) {
        SafeCall(update_callback);
    };
    w.SetUpdateCallBack(Update);
``` This is what I am doing, I have turned SOL_ALL_SAFTIES_ON on. 

[Rochet2]

Look at the example here https://sol2.readthedocs.io/en/latest/exceptions.html#various-sol-and-lua-handlers You need to change at least if (not infunc.valid()) { to if (!result.valid()) {

[theanimatorspal]

That was too foolish of me, Thank you.