我被要求写一个函数，从一个文件中读取数据并将其输入到一个双重链表中。但每次尝试运行程序时，都会显示编译错误，如下所示:

[Error] could not convert 'I1' from 'opening(World&)::Individual*' to 'Individual'
[Error] could not convert 'I2' from 'opening(World&)::Individual*' to 'Individual'

这是文件的内容:

FName1#LName1#Age1#male#University1,FName2#LName2#Age2#male#University2
FName1#LName1#Age1#male#University1,FName3#LName3#Age3#male#University3
FName7#LName7#Age7#female#University7,FName1#LName1#Age1#male#University1
FName7#LName7#Age7#female#University7,FName2#LName2#Age2#male#University2
FName6#LName6#Age6#female#University6,FName7#LName7#Age7#female#University7
FName4#LName4#Age4#male#University4,FName6#LName6#Age6#female#University6
FName4#LName4#Age4#male#University4,FName5#LName5#Age5#male#University5
FName5#LName5#Age5#male#University5,FName6#LName6#Age6#female#University6

这是我的密码:

#include <iostream>
#include <fstream>
#include <string.h>
#include <string.h>

using namespace std;

 struct Friend;
 struct World ;
 struct Individual;

struct Friend{
    Individual *self;
    Friend *next;
};

struct Individual{
    string FirstName,
    LastName,
    University;
    int Age;
    bool gender;
    Friend *myFriends;    // used as an adjacency list to enumerate all friends
    Individual *next;     // usedfor the doubly linked list denoted by World
    Individual *previous; // used for the doubly linked list denoted by World
};


struct World {
    Individual *Head, *Tail;
};
 World * InitializeList()
{
    return NULL;
}



void InsertInWorld(World & network, Individual I) {

    Individual* tmp = new Individual;
    if (tmp == NULL)
    {
        exit(1);
    }
    tmp->FirstName = I.FirstName;
    tmp->LastName = I.LastName;
    tmp->University = I.University;
    tmp->Age = I.Age;
    tmp->gender = I.gender;
    tmp->myFriends->next = NULL;
    tmp->myFriends->self = NULL;
    tmp->next = NULL;
    tmp->previous = NULL;

    if (network.Head == NULL || network.Tail==NULL) {
        network.Head = tmp;
        network.Tail = tmp;
        return;
    }
    else
    {
        tmp->next = network.Head;
        network.Head->previous = tmp;
        network.Head = tmp;
        return;
    }

}


void DisplayWorld(World network)
{
    Individual *cur = network.Head;
    
    while(cur!=NULL)
    {
        cout<<cur->FirstName<<" "<<cur->LastName<<endl;
        cur=cur->next;
    }
    
    cout<<endl;
}

void opening (World &network )
{
    struct Individual{
    string FirstName,
    LastName,
    University;
    string Age;
    string gender;
    Friend* myFriends;
    Individual* next;
    Individual* previous;
    
};

struct World {
    Individual *Head, *Tail;
};

    
    Individual *I1 ;
    Individual *I2 ;
    I1 = new Individual;
    I2 = new Individual;
    Individual *cur;
    
//  cur = network->Head;
    
    
    
 ifstream connections;
 connections.open("conn.txt");
  while (   getline(connections, I1->FirstName,'#')  && getline(connections, I1->LastName, '#')  && getline(connections, I1->University,'#')  && getline(connections,I1->Age,'#')  && getline(connections,I1->gender,',') && getline(connections, I2->FirstName,'#')  && getline(connections, I2->LastName, '#')  && getline(connections, I2->University,'#')  && getline(connections, I2->Age,'#')  && getline(connections, I2->gender,'\n')) 
    {
   
        
        InsertInWorld(network, I1);
        InsertInWorld(network, I2);
        
    }
    
    
    
}


    
    
    int main()
    {

        World network;
        Individual *I1=new Individual;
        network.Head=NULL;
        network.Tail=NULL;
        opening(network);
        DisplayWorld(network);
        
        return 0;
    }

如果有人能帮我解决这个编译错误。谢谢。