Error compiling

[Danonek 3]

This is where the error starts can anyone help , whats wrong ?

In file included from char_item.cpp:47:
belt_inventory_helper.h: In static member function 'static BYTE CBeltInventoryHelper::GetBeltGradeByRefineLevel(int)':
belt_inventory_helper.h:28: warning: comparison between signed and unsigned integer expressions
char_item.cpp: In member function 'bool CHARACTER::IsEmptyItemGrid(TItemPos, BYTE, int) const':
char_item.cpp:640: warning: comparison is always false due to limited range of data type
char_item.cpp:666: warning: comparison is always false due to limited range of data type
char_item.cpp: In member function 'bool CHARACTER::UseItemEx(CItem*, TItemPos)':
char_item.cpp:2387: warning: format '%d' expects type 'int', but argument 6 has type 'long int'
char_item.cpp:2391: warning: format '%d' expects type 'int', but argument 6 has type 'long int'
char_item.cpp:2403: warning: format '%d' expects type 'int', but argument 5 has type 'long int'
char_item.cpp:2407: warning: format '%d' expects type 'int', but argument 5 has type 'long int'
char_item.cpp:2434: warning: format '%d' expects type 'int', but argument 6 has type 'long int'
char_item.cpp:2442: warning: format '%d' expects type 'int', but argument 5 has type 'long int'
char_item.cpp:5083: warning: comparison between signed and unsigned integer expressions
char_item.cpp: In member function 'bool CHARACTER::UseItem(TItemPos, TItemPos)':
char_item.cpp:5155: warning: unused variable 'wDestCell'
char_item.cpp:5156: warning: unused variable 'bDestInven'
char_item.cpp: In member function 'bool CHARACTER::EquipItem(CItem*, int)':
char_item.cpp:6156: warning: array subscript has type 'char'
char_item.cpp: In member function 'void CHARACTER::BuffOnAttr_AddBuffsFromItem(CItem*)':
char_item.cpp:6220: warning: comparison between signed and unsigned integer expressions
char_item.cpp: In member function 'void CHARACTER::BuffOnAttr_RemoveBuffsFromItem(CItem*)':
char_item.cpp:6232: warning: comparison between signed and unsigned integer expressions
char_item.cpp: In member function 'bool CHARACTER::CanEquipNow(CItem*, const TItemPos&, const TItemPos&)':
char_item.cpp:7418: warning: unused variable 'itemType'
char_item.cpp:7419: warning: unused variable 'itemSubType'
char_item.cpp: In member function 'bool CHARACTER::IsEmptyItemGrid(TItemPos, BYTE, int) const':
char_item.cpp:679: warning: control reaches end of non-void function
char_item.cpp: In member function 'void CHARACTER::BuffOnAttr_ValueChange(BYTE, BYTE, BYTE)':
char_item.cpp:6267: warning: 'pBuff' may be used uninitialized in this function