现在我知道以前有人问过这个问题。但我已经加倍确保所有参数都正确，没有拼写错误。我仍然得到错误。有人能指导我吗？我快到我的智慧极限了!

CREATE OR REPLACE PROCEDURE VWT.WUA_DELETE_FP_REQUEST 
    (i_pLDAPUserName IN varchar2,
      i_pIReasonCode IN number,
      i_pLastName IN varchar2,
      i_pFirstName IN varchar2,
      i_pDealerID IN number,
      i_pAddr1 IN varchar2,
      i_pAddr2 IN varchar2,
      i_pCity IN varchar2,
      i_pState IN varchar2, 
      i_pZip IN varchar2,
      i_pBusinessEmail IN varchar2,
      i_pBusinessPhone IN varchar2,
      i_pReviewDate IN Date,
      i_pReviewedByWhom IN varchar2,
      i_pDealersRepID IN varchar2,
      i_pComments IN varchar2,
      i_pPrivacyUsageFlag IN varchar2,
      i_pDealersBranchID IN varchar2,
      i_pPrivacyUsageDate IN date,
      i_pMarketingFlag IN varchar2,
      i_pMarketingDate IN date,
      i_pWorkCountry IN varchar2,
      i_pOperator IN varchar2,
      o_return_status OUT integer,
      o_error_desc OUT varchar2
)

========================================================================
运行过程的代码

OracleParameter ldapUserName = new OracleParameter
         ("i_pLDAPUserName", OracleType.VarChar, 1024);
     ldapUserName.Direction = ParameterDirection.Input;
     ldapUserName.Value = ldapUserName_;
     command.Parameters.Add(ldapUserName);

 OracleParameter reasonCode = new OracleParameter
         ("i_pIReasonCode", OracleType.Number);
     reasonCode.Direction = ParameterDirection.Input;
     reasonCode.Value = reasonCode_;
     command.Parameters.Add(reasonCode);

 OracleParameter lastName = new OracleParameter
         ("i_pLastName", OracleType.VarChar, 1024);
     lastName.Direction = ParameterDirection.Input;
     lastName.Value = userDetail.LastName ?? String.Empty;
     command.Parameters.Add(lastName);

 OracleParameter firstName = new OracleParameter
         ("i_pFirstName", OracleType.VarChar, 1024);
     firstName.Direction = ParameterDirection.Input;
     firstName.Value = userDetail.FirstName ?? String.Empty;
     command.Parameters.Add(firstName);

 OracleParameter dealerID = new OracleParameter
          ("i_pDealerID", OracleType.Number);
     dealerID.Direction = ParameterDirection.Input;
     dealerID.Value = 
          Int32.Parse(String.IsNullOrEmpty(userDetail.DealerID) ? "0" : userDetail.DealerID);
     command.Parameters.Add(dealerID);

 OracleParameter address1 = new OracleParameter
          ("i_pAddr1", OracleType.VarChar, 1024);
     address1.Direction = ParameterDirection.Input;
     address1.Value = userDetail.WorkAddress1 ?? String.Empty;
     command.Parameters.Add(address1);

 OracleParameter address2 = new OracleParameter
          ("i_pAddr2", OracleType.VarChar, 1024);
      address2.Direction = ParameterDirection.Input;
      address1.Value = userDetail.WorkAddress2 ?? String.Empty;
      command.Parameters.Add(address2);

 OracleParameter city = new OracleParameter
           ("i_pCity", OracleType.VarChar, 1024);
     city.Direction = ParameterDirection.Input;
     city.Value = userDetail.City ?? String.Empty;
     command.Parameters.Add(city);

 OracleParameter state = new OracleParameter
           ("i_pState", OracleType.VarChar, 1024);
     state.Direction = ParameterDirection.Input;
     state.Value = userDetail.State ?? String.Empty;
     command.Parameters.Add(state);

 OracleParameter zip = new OracleParameter
           ("i_pZip", OracleType.VarChar, 1024);
     zip.Direction = ParameterDirection.Input;
     zip.Value = userDetail.Zip ?? String.Empty;
     command.Parameters.Add(zip);

 OracleParameter email = new OracleParameter
          ("i_pBusinessEmail", OracleType.VarChar, 1024);
     email.Direction = ParameterDirection.Input;
     email.Value = userDetail.EMail ?? String.Empty;
     command.Parameters.Add(email);

 OracleParameter phone = new OracleParameter
           ("i_pBusinessPhone", OracleType.VarChar, 1024);
      phone.Direction = ParameterDirection.Input;
      phone.Value = userDetail.Phone ?? String.Empty;
      command.Parameters.Add(phone);

 OracleParameter reviewDate = new OracleParameter
           ("i_pReviewDate", OracleType.DateTime);
     reviewDate.Direction = ParameterDirection.Input;
     reviewDate.Value = userDetail.ReviewedDate ?? (object)DBNull.Value;
     command.Parameters.Add(reviewDate);

 OracleParameter reviewedbyWhom = new OracleParameter
           ("i_pReviewedByWhom", OracleType.VarChar, 1024);
     reviewedbyWhom.Direction = ParameterDirection.Input;
     reviewedbyWhom.Value = userDetail.ReviewedByWhom ?? String.Empty;
     command.Parameters.Add(reviewedbyWhom);

 OracleParameter repID = new OracleParameter
           ("i_pDealersRepID", OracleType.VarChar, 1024);
     repID.Direction = ParameterDirection.Input;
     repID.Value = userDetail.RepID ?? String.Empty;
     command.Parameters.Add(repID);

 OracleParameter comments = new OracleParameter
          ("i_pComments", OracleType.VarChar, 1024);
     comments.Direction = ParameterDirection.Input;
     comments.Value = userDetail.Comments ?? String.Empty + comments_;
     command.Parameters.Add(comments);

 OracleParameter privacyUsageFlag = new OracleParameter
          ("i_pPrivacyUsageFlag", OracleType.VarChar, 1024);
     privacyUsageFlag.Direction = ParameterDirection.Input;
     privacyUsageFlag.Value = userDetail.PrivacyAndUsageReadFlag ?? String.Empty;
     command.Parameters.Add(privacyUsageFlag);

 OracleParameter dealersBranchID = new OracleParameter
          ("i_pDealersBranchID", OracleType.VarChar, 1024);
     dealersBranchID.Direction = ParameterDirection.Input;
     dealersBranchID.Value = userDetail.DealerBranchID ?? String.Empty;
     command.Parameters.Add(dealersBranchID);

 OracleParameter privacyUsageDate = new OracleParameter
           ("i_pPrivacyUsageDate", OracleType.DateTime);
     privacyUsageDate.Direction = ParameterDirection.Input;
     privacyUsageDate.Value = 
            userDetail.PrivacyAndUsageReadDate ??(object)DBNull.Value;
     command.Parameters.Add(privacyUsageDate);

 OracleParameter marketingFlag = new OracleParameter
           ("i_pMarketingFlag", OracleType.VarChar, 1024);
     marketingFlag.Direction = ParameterDirection.Input;
     marketingFlag.Value = userDetail.SendMarketingEmailFlag ?? String.Empty;
     command.Parameters.Add(marketingFlag);

 OracleParameter marketingDate = new OracleParameter
           ("i_pMarketingDate", OracleType.DateTime);
     marketingDate.Direction = ParameterDirection.Input;
     marketingDate.Value = 
           userDetail.SendMarketingEmailDate ?? (object)DBNull.Value;
     command.Parameters.Add(marketingDate);

 OracleParameter country = new OracleParameter
           ("i_pWorkCountry", OracleType.VarChar, 1024);
     country.Direction = ParameterDirection.Input;
     country.Value = userDetail.Country ?? String.Empty;
     command.Parameters.Add(country);

 OracleParameter oper = new OracleParameter
           ("i_pOperator", OracleType.VarChar, 1024);
     oper.Direction = ParameterDirection.Input;
     oper.Value = operator_;
     command.Parameters.Add(oper);

OracleParameter returnStatus = new OracleParameter
          ("o_return_status", OracleType.Int16);
     returnStatus.Direction = ParameterDirection.Output;
     command.Parameters.Add(returnStatus);

OracleParameter errorDesc = new OracleParameter
         ("o_error_desc", OracleType.VarChar, 1024);
     errorDesc.Direction = ParameterDirection.Output;
     command.Parameters.Add(errorDesc);