XML : Need help diagnosing errors in C++ program designed to extract timestamps from an XML file

With some help I've almost completed a program which enables me to extract the timestamps(eg:timestamp="2014-07-08T18:14:16.468Z" ) and only the timestamps from and XML file and output them to a designated output file. However, there are a handful of errors left in my code which have me at wits end, which can't seem to redress. Would someone more experienced with C++ mind helping me out? The errors appear in lines 35,38, & 47.

Screenshot of errors: http://i.imgur.com/jVUig4T.jpg

Link to XML file: http://pastebin.com/DLVF0cXY

  #include <iostream>  #include <string>  #include <fstream>  using namespace std;    int main()  {  using namespace std;  string tempStr;  // escaped double qoute.  string findStr = "timestamp=\"";    ifstream inFile;  ofstream outFile;  outFile.open("Outputdata.txt");  inFile.open("Groupproject.xml");  if (inFile.fail()) {      cout << "Error Opening File" << endl;      system("pause");      exit(1);  }    size_t found;    while (inFile) {      getline(inFile, tempStr);      found = tempStr.find(findStr);      if (found != std::string::npos)      {          break;      }  }    // Erases from beggining to end of timestamp="  tempStr.erase(tempStr.begin(), (found + tempStr.length()));    // Finds index of next double qoute.  found = tempStr.findStr("\"");    if (found = std::string::npos)  {      cerr << "Could not find matching qoute:";      exit(1);  }    // Erases from matching qoute to the end of the string.  tempStr.erase(found, tempStr.end());    cout << "timestamp found" << tempStr << "Saving to outFile" << endl;    outFile << tempStr;    inFile.close();  outFile.close();  system("pause");  return 0;  }