Can not find column 22276451.

Good morning, I'm developing a code that can defer the X and Y values of a chart I inserted into ASP.NET. For this I made a query to the sql server to be returned to the average of a column, until the following error appeared: Can not find column 22276451. I need your help to solve this problem.

Here is the code:

 protected void Chart1_Load6(object sender, EventArgs e)
    {

        String connectionString =
       "Data Source=localhost;" +
       "Initial Catalog=DB_SACC;" +
       "User id=sa;" +
       "Password=1234;";

        SqlConnection connection = new SqlConnection(connectionString);

        SqlCommand cmd = new SqlCommand();

        string textt = "  SELECT AVG (Total_Divida) FROM t_pagamentos";

        cmd.CommandText = textt;

        connection.Open();

        cmd.Connection = connection;

        cmd.CommandType = CommandType.Text;

        decimal average = (decimal)cmd.ExecuteScalar();

        Chart1.Series["Series1"].YValueMembers = "Banco";

        Chart1.Series["Series1"].XValueMember =Convert.ToString( average);
  }