C++ - is not a class or namespace error - c++

Question

I'm fairly new to C++ and I'm getting the following error 'fw' is not a class or namespace in the main file when I try to call the create_event_file() function.
Here is my code.
#ifndef FILE_WRITER_H
#define FILE_WRITER_H
#include <string>
using namespace std;
class File_Writer{
private:
int test;
public:
File_Writer() { }
void create_event_file(void);
void write(const string file_name, string data);
};
#endif // FILE_WRITER_H
The cpp file
#include "file_writer.h"
#include <iostream>
#include <fstream>
using namespace std;
File_Writer::File_Writer(void){
cout << "Object of File_Writer is created" << endl;
}
void File_Writer::create_event_file(void){
ofstream outputFile;
outputFile.open("event.txt");
string data;
cout << "Enter event title : " << endl;
getline(cin,data);
outputFile << textToSave;
cout << "Enter event date : " << endl;
getline(cin,data);
outputFile << textToSave;
cout << "Enter event start time : " << endl;
getline(cin,data);
outputFile << textToSave;
outputFile.close();
}
void File_Writer::write(const string file_name, string data){
ofstream outputFile;
outputFile.open("all.txt");
outputFile << data;
outputFile.close();
}
And the main file
#include <iostream>
#include "file_writer.h"
using namespace std;
int main(){
string input;
File_Writer fw;
cout << "Welcome to the event creation program!\n" << endl;
cout << "---------------------------" << endl;
cout << "| event - To create event file |" << endl;
cout << "| entrants - To create entrants file |" << endl;
cout << "| coursess - To create courses file |" << endl;
cout << "---------------------------\n" << endl;
getline(cin,input);
if(input == "event")
fw::create_event_file();
}
Thanks in advance

Answer 1

Replace this, which implies that fw is the name of a class or namespace:
fw::create_event_file();
// ^^ This is a "scope opearator"
With this, which implies that fw is a variable:
fw.create_event_file();
// ^ This is a "member access opearator"