procedure or function has too many arguments specified sql c#

Question

1.  This is my c# code.i am facing procedure or function has too many arguments specified error

DataTable table = new DataTable();
                SqlDataReader myReader;
                string sqlDataSource = _configuration.GetConnectionString("EmployeeAppCon");
               
                SqlConnection sql = new SqlConnection(sqlDataSource);
                sql.Open();
               
                    SqlCommand scCommand = new SqlCommand("SP_Grouplist", sql);
                
                    scCommand.CommandType = System.Data.CommandType.StoredProcedure;
                scCommand.Parameters.Clear();
                foreach (var t in StringToAarry)
                {
                    scCommand.Parameters.Add("@Group_Name", SqlDbType.VarChar).Value = model.Group_Name;
                    scCommand.Parameters.Add("@user_id", SqlDbType.VarChar).Value = t;
                    scCommand.Parameters.Add("@ImagePath", SqlDbType.VarChar).Value = model.ImagePath;
                    scCommand.Parameters.Add("@Created_by", SqlDbType.VarChar).Value = Created_by;
                    scCommand.Parameters.Add("@Flag", SqlDbType.Int).Value = flag;
                    flag = flag + 1;
                    //scCommand.Parameters.Clear();
                }
                scCommand.ExecuteNonQuery();

                myReader = scCommand.ExecuteReader();

                    table.Load(myReader);
                    
                    myReader.Close();
                    sql.Close();

 

-------

this is my Stored procedure

ALTER PROCEDURE [dbo].[SP_Grouplist]

@Group_Name varchar(50),
@user_id varchar(500),
@ImagePath varchar(500),
@Created_by varchar(50),
@Flag int
AS
Declare @GroupId Int

BEGIN
    SET NOCOUNT ON;

    
/* Create the New Group in Group Name Table */
    if Not exists (Select * from GroupNames with (nolock ) where Group_Name=@Group_Name and  Created_by =@Created_by )
    Begin 
        Select @GroupId = IsNull(Max(Group_Id),0)+1 from GroupNames with (nolock)
                Insert into GroupNames (Group_id, Group_Name,Created_by) Select @GroupId , @Group_Name , @Created_by 
    End 

/* Get Group Id from Group Name table for the existing record */
    if exists (Select * from GroupNames with (nolock ) where Group_Name=@Group_Name and  Created_by =@Created_by ) 
    Begin 
        Select @GroupId=Group_id from GroupNames with (nolock ) where Group_Name=@Group_Name and  Created_by =@Created_by
    End 

/* Going to add the member/user into the Group list table by refering Group Name Table */

    if @Flag=1 

     Begin 
        --Delete from GroupNames where Group_Id=@GroupId 
          Delete from GroupList Where Group_Id=@GroupId and created_by = @Created_by
     End 

    if  Exists (Select * from GroupList where Group_Id=@GroupId and created_by = @Created_by)
    Begin 
        --Select @GroupId= Group_Id from  GroupList where Group_Name=@Group_Name and created_by = @Created_by
        
        --Delete  from GroupList where Group_Name=@Group_Name and created_by =@Created_by

        Insert into GroupList
        Select @GroupId Group_Id, @ImagePath ImagePath,item user_id,
        @Created_by Created_by, getdate() created_date   from dbo.[SplitString] (@user_id,',') Where item Not in 
        (Select user_id from GroupList where Group_Id= @GroupId and created_by = @Created_by)
        
        Update GroupList set ImagePath=@ImagePath where Group_Id=@GroupId and created_by = @Created_by

    End 
    Else 
     Begin 
        --Select @GroupId= IsNull(Max(Group_Id),0)+1 from  GroupList --where Group_Name=@Group_Name and created_by = @Created_by
        
        Insert into GroupList
        
        Select @GroupId Group_Id,@ImagePath ImagePath, item user_id ,   @Created_by Created_by,getdate() created_date from dbo.[SplitString] (@user_id,',')
    

     End 

     
END