Exception when I try to run Steam functions inside Visual Studio

Hey guys,
I tried to run the SteamAPI_Init(); function inside the Character.cpp, but Visual Studio comes with this:

Exception when 0x000000014131D144 in Steam_461.exe: 0xC0000005: Access violation reading at position 0x0000000000000730

(i translated it with Google Translator because my Visual Studio is (as same as me) in german). I don’t understand much about C++, but what does that mean and how can I fix it?

I’m not sure about that function but, have you seen Rama’s tutorial on the Wiki on how to use the Steam SDK? I’m fairly sure you’ll need it to develop with Steam!