An identifier was expected here, but not found. 

In C, an identifier is expected in the following situations:

• in a list of parameters in an old-style function header
• after the reserved words struct or union when the braces are not present, and
• as the name of a member in a structure or union (except for bit fields of width 0).

In C++, an identifier is also expected in these situations:

• in a list of base classes from which another class is derived, following a double colon (::), and
• after the reserved word "operator" when no operator symbol is present.