Saving to a .txt file

Hi, I need some help getting this to work right. I get errors with the last few lines of my code. It works like this or should work like this:
1st if say doesnt = anything then(else) save this to a file
2nd open file
3rd look in file for whats in side, then that will be saved to a string
4th learn=line+say+nothing+learn+whitespace
5th save "learn" to file
6th close file
last restart loop of my programe

Thats about it on how it should work, this what error I get is: no matching function for call to `getline(std::string&, std::string&)' hope you can help out, thanks if you can or point out if I made a mistake some where.

Code:

string say;
string line;
string learn;
string learnfile = "learn.txt";
string nothing = ": ";
string whitespace = " ||";

//more code in middle here

    else{cout<<"Hmm, I must not have this in my data yet, can you plez tell me what this word means?"<<endl;
        getline(cin, learn);
        ifstream learnfile;
        ofstream myfile;
        myfile.open (learnfile.c_str());
        while (getline(learnfile, line))
          learn=line+say+nothing+learn+whitespace;
          myfile << learn;
        learnfile.close ();
        cout<<"Saved, thanks for your help on making me better."<<endl;}}}//end of code

Nvm^^; I got it wow, took me forever to get thisO.o; um you can delete this if you like^^;