how to solve the assembly reference error.

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C#

HEllo Team,

I am getting the error as follow:

Error   2'QBPO.Application.Bpo.DataManagers.QBpoDataManager'
does not contain a definition for 'UpdateQCProcessed'
 and no extension method 'UpdateQCProcessed' accepting a first argument
of type 'QBPO.Application.Bpo.DataManagers.QBpoDataManager' could be found
 (are you missing a using directive or an assembly reference?)

as i have added the .dll in references and Namespace in the .cs file.
Then also i am getting the error .Kindly help.
Pls find the code
public Result Add(IEntityBase entityBase)
{
Result result = null;
try
{
IUserEntity userEntity = entityBase as IUserEntity;
Logger.Write("Inside BpoManagerWrite.Add()", LogType.Information);
QBpoDataManager bpoDataManager = new QBpoDataManager();
OcrDataManager ocrDataManager = new OcrDataManager();
result = new Result();
ICustomerLoanData customerLoanData = QBpoEntityCreator.GetCustomerLoanDataEntity();
using (TransactionScope transactionScope = new TransactionScope(TransactionScopeOption.Required, CommonUtility.GetRequireTransactionOptions()))
{
if(userEntity.Role == QBPOUserRole.QbpoQcUser.ToString())
{
bpoDataManager.Update(entityBase);
bpoDataManager.UpdateQCProcessed(entityBase);
}
else
{
////Add in LoanDataTable
bpoDataManager.Add(entityBase);
////Update in OCRLoan Tbl Table.Processed= 1, updated by =1 , updated date = Now
ocrDataManager.Update(entityBase);
}
transactionScope.Complete();
}

Logger.Write("Exiting BpoManagerWrite.Add()", LogType.Information);
}
catch (Exception exception)
{
exception.HandleException(Global.CONSTSTREXCPOLICYBUSINESS);
result.AddError("Technical Error occured. Please contact to system administrator");
}

return result;
}
and NameSpace are:

namespace QBPO.Application.Bpo.BusinessManagers
{
    using System;
    using System.Transactions;
    using QBPO.Application.Bpo.BusinessInterfaces;
    using QBPO.Application.Bpo.DataManagers;
    using QBPO.Entities.Bpo;
    using QBPO.Entities.Bpo.Entity.Interfaces;
    using QBPO.Entities.UserManagement;
    using QBPO.Framework;

}
Secondily this is the DataManagerCode where i am calling the method

public int UpdateQCProcessed(IEntityBase entityBase)
      {
          int rowsAffected = int.MinValue;
          try
          {
              Logger.Write("Inside QBpoDataManager.UpdateQCProcessed()", LogType.Information);
              ICustomerLoanData customerLoanDataEntity = entityBase as ICustomerLoanData;
              CommonDataAccess.CreateStoredProcCommandWrapper(QBpoConstants.SPUPDATECUSTOMERLOANDATA);
              CommonDataAccess.AddInParameter(QBpoConstants.CUSTOMERLOANDATAID, DbType.Int32, customerLoanDataEntity.Id);
              CommonDataAccess.AddInParameter(QBpoConstants.UPDATEDON, DbType.DateTime, DateTime.Now.ObjectToDBDateTime());
              CommonDataAccess.AddInParameter(QBpoConstants.UPDATEDBY, DbType.Int32, customerLoanDataEntity.UpdatedBy);
              rowsAffected = CommonDataAccess.ExceuteNonQuery();
              Logger.Write("Exiting QBpoDataManager.UpdateQCProcessed()", LogType.Information);
          }
          catch (Exception exception)
          {
              throw exception;
          }

          return rowsAffected;
      }

and Namespace are:

namespace QBPO.Application.Bpo.DataManagers
{
    using System;
    using System.Data;
    using System.Text;
    using QBPO.Entities.Bpo;
    using QBPO.Entities.Bpo.Entity.Interfaces;
    using QBPO.Entities.Common;
    using QBPO.Entities.UserManagement;
    using QBPO.Framework;
    using QBPO.Framework.Application;

}