Sql – Stored procedure or function expects parameter which is not supplied

I am trying to insert data into a SQL Server database by calling a stored procedure, but I am getting the error

Procedure or function 'SHOWuser' expects parameter '@userID', which was not supplied.

My stored procedure is called SHOWuser. I have checked it thoroughly and no parameters is missing.

My code is:

public void SHOWuser(string userName, string password, string emailAddress, List<int> preferences)
{
        SqlConnection dbcon = new SqlConnection(conn);

        try
        { 
            SqlCommand cmd = new SqlCommand();

            cmd.Connection = dbcon;
            cmd.CommandType = System.Data.CommandType.StoredProcedure;
            cmd.CommandText = "SHOWuser";

            cmd.Parameters.AddWithValue("@userName", userName);
            cmd.Parameters.AddWithValue("@password", password);
            cmd.Parameters.AddWithValue("@emailAddress", emailAddress);

            dbcon.Open();

            int i = Convert.ToInt32(cmd.ExecuteScalar());

            cmd.Parameters.Clear();
            cmd.CommandText = "tbl_pref";

            foreach (int preference in preferences)
            {
                cmd.Parameters.Clear();
                cmd.Parameters.AddWithValue("@userID", Convert.ToInt32(i));
                cmd.Parameters.AddWithValue("@preferenceID", Convert.ToInt32(preference));

                cmd.ExecuteNonQuery();
            }
        }
        catch (Exception)
        {
            throw;
        }
        finally
        {
            dbcon.Close();
        }

and the stored procedure is:

ALTER PROCEDURE [dbo].[SHOWuser]
(
    @userName varchar(50),
    @password nvarchar(50),
    @emailAddress nvarchar(50)
)
AS
BEGIN
    INSERT INTO tbl_user(userName, password, emailAddress) 
    VALUES (@userName, @password, @emailAddress)

    SELECT
        tbl_user.userID, tbl_user.userName,
        tbl_user.password, tbl_user.emailAddress, 
        STUFF((SELECT ',' + preferenceName 
               FROM tbl_pref_master
               INNER JOIN tbl_preferences ON tbl_pref_master.preferenceID = tbl_preferences.preferenceID
               WHERE tbl_preferences.userID = tbl_user.userID
               FOR XML PATH ('')), 1, 1, ' ' ) AS Preferences
    FROM
        tbl_user

    SELECT SCOPE_IDENTITY();
END

This is the second stored procedure tbl_pref which is used in the same function:

ALTER PROCEDURE [dbo].[tbl_pref]
    @userID int,
    @preferenceID int
AS
BEGIN
    INSERT INTO tbl_preferences(userID, preferenceID) 
    VALUES (@userID, @preferenceID)
END