Debug Assertion Failed._BLOCK_TYPE_IS_VALID

Question

问题在于 删除x 。在下面的示例中，我创建了一个带有constructor的类，该类将带有整数值的文件加载到array of x中。和朋友的功能输出文件，那些工作正常，但问题是deconstructor，我得到了这个错误，并尝试搜索解决方案，但没有用。

 class MyFile{
    private:
        int *x;
        int size;
        FILE *file;
    public:
        MyFile(char *);
        MyFile();
        ~MyFile();
        friend ostream& operator<<(ostream &co, MyFile fi);

    };


    MyFile::~MyFile()
    {
        delete x;
            fclose(file);

    }
    MyFile::MyFile(char *Loc_Name)
    {
        file = fopen(Loc_Name, "r");
        int counter = 0, reader,i=0;
        if (file == NULL){ cout << "the file doesnt exists"; exit(0); }
        else
        {
            while (!feof(file))
            {
                fscanf(file, "%d", &reader);
                counter++;

            }
            size = counter;  // the size of array equals counter
            x = new int[size];
            fseek(file, 0, SEEK_SET); // to return file to set otherwise it wont get inside the loop 
            while (!feof(file))
            {
                fscanf(file, "%d", &reader);
                x[i] = reader;
                i++;
            }



        }



    }
    ostream& operator<<(ostream &co, MyFile fi)
    {
        for (int i = 0; i < te.size; i++)
        {
            co << "the elements = " << te.x[i] << endl;
        }
        return co;
    }
    int main()
    {
        MyFile a("d://here.txt"); 
        cout << a;
            return 0;
    }