Message In this parameter list, "<param>" must either be a type or must be followed by a ",". Description In processing a function declaration, the compiler has found a case where the parameter list begins with two identifiers not separated by a comma and where the first identifier is not a type specifier. If this is an old-style declaration the two identifiers must be separated by a comma. If this is a prototype declaration, the first identifier must specify a type. User Action Correct the function parameter specifiers.