error: ‘string’ in namespace ‘std’ does not name a type

This error message is informing you that the compiler does not recognize the type "string" in the namespace "std".

This usually occurs when you forget to include the necessary header file at the beginning of your code, which defines the "string" type. To fix this error, you need to include the header file that declares the "string" type, like this:

#include <string>
using namespace std;

// Your code here

This will make sure that the compiler knows what "string" means and can recognize it as a valid type.