Error LNK2005

#pragma once
#include <stdio.h>
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
 
class LexerAnalyses
{
 
    std::string nextToken;
    std::string strAfterToken;
    std::ifstream file;
    std::vector<std::string> specialWord;
    
 
public:
 
    LexerAnalyses();
    ~LexerAnalyses();
    ////////////////////
    void GetToken();
    bool OpenFile();
    void CloseFile();
    void SetReservedWords();
    std::string GetReservedWords(std::string token, std::vector<std::string> specialWord);
    std::string ParseLex();
};

#pragma once
#include "TreeToken.h"
#include "LexerAnalyses.h"
 
 
class SyntaxAnalyzer
{
    LexerAnalyses lexer;
    std::string nextToken;
    TNode<std::string>** TreeNodeDo;
 
public:
    SyntaxAnalyzer();
    ~SyntaxAnalyzer();
 
private:
    void startTokenSyntax();
    void CheckIndentifierToken();
    void CheckStatments();
 
};

#include <iostream>
#include <string>
 
 
struct SetErrors
{
    std::string compError[100];
    int compErrorLen;
    SetErrors()
    {
        compErrorLen = 0;
    }
}ErrorStruct;
 
template<class T>
struct TNode 
{
    T value;
    TNode *pleft, *pright;
    //constructor
    TNode() 
    {
        pleft = pright = 0;
    }
};
 
template<class T>
void AddInTree(TNode<T>** TNodeDoublePointer, T value) 
{
    if (!(*TNodeDoublePointer))
    {
        TNode<T>* p = new TNode<T>();
        p->value = value;
        *TNodeDoublePointer = p;
    }
    else 
    {
        if ((*TNodeDoublePointer)->value > value)
            AddInTree(&((*TNodeDoublePointer)->pleft), value);
        else
            AddInTree(&((*TNodeDoublePointer)->pright), value);
    }
}
 
 
template<class T>
void WalkTree(TNode<T>* TNodePointer)
{
    if (TNodePointer) 
    {
        WalkTree(TNodePointer->pleft);
        cout << TNodePointer->value << ' ';
        WalkTree(TNodePointer->pright);
    }
}

extern SetErrors ErrorStruc;