i've never actually figured out how to fix this, but i only get it when i try to put in S2S hacks

Code:
Main.obj : error LNK2001: unresolved external symbol "public: static int __cdecl LTAssert::RunAssert(char const *,char const *,int,char const *,bool,char const *,...)" (?RunAssert@LTAssert@@SAHPBD0H0_N0ZZ)
1>C:\Users\Boxxi\Documents\Visual Studio 2010\Projects\Hotkey2\Release\Hotkey2.dll : fatal error LNK1120: 1 unresolved externals
i just wanted to test some stuff i have, idk how to fix it and nothing i googled helped