Ошибка ifstream или getline()

#include <iostream> 
#include <fstream>  
#include <string>
#include <conio.h>
#include <locale>
using namespace std; 
 
 
string DecryptLine(ifstream &Stream, short Key, short AlphabetLength, short FirstAlphabetLetter)//read for reading, firltletter,key and lengh for formula,
{
    string Line;//line of text
    bool IsUpper;// check if uppercase
    getline(Stream, Line);
    for (unsigned long i = 0; i < Line.length(); i++)
    {
        IsUpper = false;
        if (Line[i] == 'ё' || Line[i] == 'Ё')
        {
            Line[i] = -27;/* 'е'= -27 or 101*/
        }
        if ((Line[i] >= 'А') && (Line[i] <= 'я'))
        { 
            if (Line[i] <= 'Я')
            {
                IsUpper = true; 
            }
 
            Line[i] = tolower(FirstAlphabetLetter +((Line[i] - Key + AlphabetLength) % AlphabetLength));
 
            if(IsUpper==true)
            {
                Line[i]=toupper(Line[i]);
            }
        }
    }
    Line += '\n';
    return Line;
}
 
 
void ThreeMostFrequentLetters(ifstream &Read,short AlphabetLength, unsigned char *MostFrequentLetters)// read for reafing, lengh for array, mostfreq - the goal
{
    string Line;//line of text
    short AlphabetPlace; /*place of letter in the alphabet*/
    unsigned long Buff[2];
    unsigned long **TextLetterFrequency = new unsigned long*[2];/*letter frequency in text*/
    if (TextLetterFrequency == NULL) /*have memory been allocated?*/
    {
        cout << "Error:Memory allocation error.Press any key to exit...";
        _getch();
        exit(0);
    }
    for(short i=0; i<2;i++)
    {
        TextLetterFrequency[i] = new unsigned long[AlphabetLength];
        if (TextLetterFrequency[i] == NULL) /*have memory been allocated?*/
        {
            cout << "Error:Memory allocation error.Press any key to exit...";
            _getch();
            exit(0);
        }
    }
    for (short i = 0; i < AlphabetLength; i++) /*reset the values of the array elements*/
    {
        TextLetterFrequency[0][i] = i+224 ;
        TextLetterFrequency[1][i] = 0;
    }
 
    Read.seekg(0,Read.beg);
    while (!Read.eof()) /*let's find letters frequency in text */
    {
        getline(Read, Line);
        for (unsigned long i = 0; i < Line.length(); i++)
        {
            if (Line[i] == 'ё' || Line[i] == 'Ё') /*'ё' is strange exception in the alphabet*/
            {
                Line[i] = -27;// 'е'= -27 or 101
            }
            if ((Line[i] >= 'А') && (Line[i] <= 'я')) /*isalpha isn't working for some reason*/
            {
                AlphabetPlace = tolower(Line[i]) % AlphabetLength;
                TextLetterFrequency[1][AlphabetPlace]++;
            }
        }
 
    }
    for (short j = 0; j < AlphabetLength - 1; j++)
    {
        for (short i = 0; i < AlphabetLength - 1 - j; i++)
        {
            if(TextLetterFrequency[1][i]<TextLetterFrequency[1][i+1])
            { 
                Buff[0] = TextLetterFrequency[0][i];
                Buff[1]= TextLetterFrequency[1][i];
                TextLetterFrequency[0][i] = TextLetterFrequency[0][i+1];
                TextLetterFrequency[1][i] = TextLetterFrequency[1][i + 1];
                TextLetterFrequency[0][i+1] = Buff[0];
                TextLetterFrequency[1][i+1] = Buff[1];
            }
        }
    }
 
    for (short i = 0; i < 3; i++)
    {
        MostFrequentLetters[i] = TextLetterFrequency[0][i];
    }
 
    delete[] TextLetterFrequency;
}
 
 
short KeyFind(short FirstAlphabetLetter,short AlphabetLength,unsigned char* AlphabetLetterFrequenc,unsigned char *MostFrequentLetter,ifstream &Read)// first letter, lengh - for decrypt line func, freq-es for sampels
{
    string DecryptedLine;/*decrypted line*/
    char Way;
    short Key;/* key for the Caesar code*/
    short t = -1;/*counter for AlphabetLetterFrequenc, if no one of the 3 most frequent letters 
               wasn't the most frequent letter in alphabet */
    
    do /*key find/test*/
    {
        t++;
        for (short j = 0; j < 3; j++)
        {
            Key = MostFrequentLetter[j] - AlphabetLetterFrequenc[t];
            cout << "Key= " << Key << endl;
            Read.seekg(0,Read.beg);
            for (short i = 0; i < 2; i++)
            {
                DecryptedLine = DecryptLine(Read, Key, AlphabetLength, FirstAlphabetLetter);
                cout << DecryptedLine;
            }
            cout << endl;
        }
        cout <<"Was there a reasonable decoding was shown? Press 'y' if Yes, press any key if No"<<endl;
        Way = _getch();
    } while (!(Way=='y'||Way=='н'));
    cout << "Enter the right key:"; /*This could be done automatically, but the extra check won't hurt.*/
    cin >> Key;
    return Key;
}
 
 
int main()
{
    setlocale(LC_ALL, "Rus");
    string Path,//path to text file
        Line;//line of text
    short AlphabetLength= 32; /*length of alphabet, for exaple, for Russian = 32, 'ё' is not included*/
    short FirstAlphabetLetter= 224; /*ASCII code of lower case first alphabet letter, for Russian 'a'= -32*/
    unsigned char AlphabetLetterFrequency[32] = { 'о','е','а','и','н','т','с','р','в','л','к','м','д','п','у','я','ы','ь','г','з','б','ч','й','х','ж','ш','ю','ц','щ','э','ф','ъ'}; /*frequency of the letters of # language*/
    short Key;/* key for the Caesar code*/
    unsigned char MostFrequentLetters[3]; /*3 most frequent letters in text*/
 
    cout << "Enter crypted file path: " ;
    getline(cin, Path);
    ifstream Read;
    Read.open(Path);
    if (!Read.is_open()) /*file existens checking*/
    {
        cout << "Error:File doesn't exist. Press any key to exit...";
        _getch();
        exit(0);
    }
 
    ThreeMostFrequentLetters(Read,AlphabetLength,MostFrequentLetters);
    Key = KeyFind(FirstAlphabetLetter,AlphabetLength,AlphabetLetterFrequency,MostFrequentLetters,Read);
 
    Path = Path.substr(0, Path.length() - 4) + "Decrypted.txt";/* let's save decrypted file in same path*/
    ofstream Write(Path);
    if (!Write.is_open()) /*file creation checking*/
    {
        cout << "Error:File can't be created.Press any key to exit..."<<endl;
        _getch();
        exit(0);
    }
    else
    {
        cout <<endl<<"File successesfuly created";
    }
 
    Read.seekg(0,Read.beg);
    while (!Read.eof()) /*finale file decryption*/
    {
        Line = DecryptLine(Read,Key,AlphabetLength,FirstAlphabetLetter);
        Write << Line;
    }
 
    if (Key != 0)
    {
        cout << " and decrypted."<<endl;
    }
    else
    {
        cout << ". Decryption not needed." << endl;
    }
    Read.close();
    Write.close();
    cout << "Press any key to exit...";
    _getch();
    return 0;
}