left of '.identifier' must have class/struct/union type
The operand to the left of the period (.) is not a class, structure, or union.
Example
int i; struct S { public: int member; } s, *ps; void main() { i.member = 0; // error, i is not a class type ps.member = 0; // error, ps is a pointer to a structure s.member = 0; // OK, s is a structure type ps->member = 0; // OK, ps points to a structure S }