HELP ADD SHOPPING_CART

c:\Users\Serveur\Source\Source\WORLDSERVER\ItemUpgrade.cpp(1404): warning C4244: '=' : conversion from 'float' to 'int', possible loss of data
C:\Users\Serveur\Source\Source\_Interface\WndShop.cpp(1110): warning C4244: 'argument' : conversion from 'DWORD' to 'short', possible loss of data
c:\Users\Serveur\Source\Source\WORLDSERVER\ItemUpgrade.cpp(1479): warning C4244: 'argument' : conversion from 'DWORD' to 'BYTE', possible loss of data
c:\Users\Serveur\Source\Source\WORLDSERVER\ItemUpgrade.cpp(1480): warning C4244: 'argument' : conversion from 'DWORD' to 'BYTE', possible loss of data
c:\Users\Serveur\Source\Source\WORLDSERVER\ItemUpgrade.cpp(1489): warning C4244: 'argument' : conversion from 'DWORD' to 'BYTE', possible loss of data
c:\Users\Serveur\Source\Source\WORLDSERVER\ItemUpgrade.cpp(1603): warning C4018: '>=' : signed/unsigned mismatch
c:\Users\Serveur\Source\Source\WORLDSERVER\DPSrvr.cpp(12800): warning C4018: '>' : signed/unsigned mismatch
WorldServer error LNK2019: unresolved external symbol "public: void __thiscall CART_ITEM::Serialize(class CAr &)" (?Serialize@CART_ITEM@@QAEXAAVCAr@@@Z) referenced in function "public: void __thiscall CDPSrvr::OnBuyItemCart(class CAr &,unsigned long,unsigned long,unsigned char *,unsigned long)" (?OnBuyItemCart@CDPSrvr@@QAEXAAVCAr@@KKPAEK@Z)
WorldServer fatal error LNK1120: 1 unresolved externals