Issue with class composition and method

[BarelyOtaku]

I'm working on this I/O system and Eclipse is being a pain by giving me an error. I'm using a function that has been declared and implemented but the text-editor is telling me (Method could not be resolved). I included the header in which the function is an there's still no hopes of clearing this error.

To add salt to the wound, the open() function from library fstream acts up and tells me I'm using invalid arguments as I am typing this.

/*
 * data.h
 *
 *  Created on: Jul 30, 2015
 *      Author: jackymoon
 */

#ifndef DATA_H_
#define DATA_H_

#include "lineseq.h"
template<typename T>

class Data {
  public:
	Data(int numbLines) :
		currentLine(0),
		numberLines(numbLines)
  {
		linePtr = new linePtr[numberLines];
  }
    ~Data(){}

    void add(std::string type, int size, std::string seq){
    	linePtr[currentLine++] = linePtr(type,size,seq);
    } //<--- HERE I DECLARE MY FUNCTION

  private:
    int currentLine;
    int numberLines;
    LineSeq *linePtr;

};

#endif /* DATA_H_ */

/*
 * reader.h
 *
 *  Created on: Jul 31, 2015
 *      Author: jacky
 */

#ifndef READER_H
#define READER_H

#include "data.h"
#include "lineseq.h"
#include <fstream>
#include <string>

template <typename T>
class Reader{

  public:
	void ReadAndWrite(const std::string filepath) {
		Data Datastorage(10); //for demo purposes
		std::ifstream read;
		read.open(filepath); //ERROR highlighting open (invalid arguments)
		while (read.eof()){
			while (read >> dType){
				read >> dSize;
				std::getline(read, dSeq);
				Datastorage.add(dType, dSize, dSeq); //ERROR method could not be resolved.
			}
		}
	}
  private:
	std::string dType;
	int dSize;
	std::string dSeq;

};

#endif 

To me these errors don't seem to make sense. Am I actually wrong here or is there an issue with my compiler?

[MikeyBoy]

You say:

the text-editor is telling me (Method could not be resolved).

Does your code actually compile?

[BarelyOtaku]

No it doesn't compile because of those two highlighted errors