从向量中删除元素时发生奇怪的错误

我正在写一个 C++ 实验室。本质是编写一个程序，接收两个文件作为输入，一个带有文本文件，另一个是空文件，在第二个空文件中，单词应该显示在一列中，旁边的数字显示这些单词的数量与文本会面（所有使用超过 1 次的单词都应显示）。本质很简单，原则上，一切都为我解决了，但由于某种原因，在一个地方，当从向量中删除元素时，程序以错误结束。（在另一个地方，我删除了相同的元素仅来自另一个向量的方式，并且没有错误）：

for (int j = 0; j < wordsCount; j++) {
    if (WordNumber[j] == 1) {
    WordNumber.erase(WordNumber.begin()+j);
    }
}

这是代码：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <vector>
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}



void MainWindow::on_pushButton_clicked()
{
QString firstFileName = ui->lineEdit->text();
QString secondFileName = ui->lineEdit2->text();

qDebug()<<firstFileName;
qDebug()<<secondFileName;
string thePath = "C:/Users/leoni/Desktop/Science/c++/Qtprojects/Qt projects/build-calcFrequency_lab-Desktop_Qt_6_2_0_MinGW_64_bit-Debug/debug/" + firstFileName.toStdString();
string thePath2 = "C:/Users/leoni/Desktop/Science/c++/Qtprojects/Qt projects/build-calcFrequency_lab-Desktop_Qt_6_2_0_MinGW_64_bit-Debug/debug/" + secondFileName.toStdString();

ifstream fin(thePath);
ofstream fout(thePath2, ios_base::trunc);
string g,t;
int wordsCount = 0;


while (fin>>t) {
    wordsCount++;
}
//string words[wordsCount];
vector <string> words(wordsCount);
fin.close();
for (int i = 0; i < wordsCount; i++) {
    words[i] = "";
}

fin.open(thePath);
int cnt = -1;
while (fin>>g) {
cnt++;
words[cnt] = g;
}

qDebug()<<wordsCount;
fin.close();
fout.close();



for (int i = 0; i < wordsCount; i++) {
    if (words[i] == "," || words[i] == "." || words[i]==":"){
        words.erase(words.begin()+i);
    }
}

for (int i = 0; i < wordsCount; i++) {
    for (int j = 0; j < words[i].length(); j++) {
        if (words[i][j] == ','||words[i][j] == '.'||words[i][j] == ':'||words[i][j] == ':'||words[i][j] == '!'||words[i][j] == '?') {
            words[i].erase(words[i].begin()+j);
        }
    }
}


//counting part:
vector <int> WordNumber (wordsCount);

for(int i = 0; i <wordsCount; i++) {
    WordNumber[i] = 0;
}

for (int i = 0; i < wordsCount; i++) {
    string theWord = "";
    for (int j = i; j < wordsCount; j++) {
        theWord = words[i];
        if (theWord == words[j]) {
            WordNumber[i]++;
        }
    }
}

for (int j = 0; j < wordsCount; j++) {//Вот место ошибки
    if (WordNumber[j] == 1) {
    WordNumber.erase(WordNumber.begin()+j);
    }
}


fout.open(thePath2,ios_base::app);
for (int i = 0; i < cnt+1; i++) {
   fout <<words[i]<<" - "<<WordNumber[i]<<endl;
}

 fout.close();

}

当我删除这个地方时，一切正常，它只是将所有曾经使用过的单词以及主题输出到文件中。请解释错误是什么，因为在此之前我以相同的方式从向量中删除了元素并且一切正常。请帮帮我。