SqlParameterCollection only accepts non-null SqlParameter type objects, not String objects

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Dear All

i searched on google but did not find exact solution.. pls help to resolve this problem..

I have a procedure and i am using to insert values in table..like below
but i got error like:-
The SqlParameterCollection only accepts non-null SqlParameter type objects, not String objects.



This PROCEDURE



alter PROCEDURE ReadInsert
(
@HSCP_FILE_NAME char(50)
)

as
Begin
declare @PLANT_CD char(10)
declare @NEW_SUPP_CD char(20)
declare @NEW_SUPP_LOC char(10)
declare @SUPP_LOC_PROV_STAT char(10)
declare @SUPP_INVOICE_DT char(20)
declare @NEWINVOICENO char(20)
declare @PART_RCV_DT char(10)

declare @OE_INVOICE_NUM char(20)
declare @FORM31NO char(20)
declare @FINYEAR char(10)

declare @AvgD19 float
declare @SumD16 float
declare @SumD24 float
declare @RoundD24 float
declare @RoundD16 float
declare @ValueSalesTxNw float
declare @RoundD21 float


@OEFILE char(50)=null
@VATFILE char(50)=null



select TOP 1 @PLANT_CD = D4_PLANT_CODE from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @NEW_SUPP_CD = D5_VENDOR_CODE from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @NEW_SUPP_LOC = D6_VENDOR_LOC from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @SUPP_LOC_PROV_STAT = D7_VENDOR_SUPPLY_STATE from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @SUPP_INVOICE_DT = D8_INVOICE_DATE from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @NEWINVOICENO = D26_INVOICE_NO from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @PART_RCV_DT = D14_PART_RECEIVED_DATE_AT_HCIL from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @OE_INVOICE_NUM = D9_INVOICE_NO_OF_THE_SUPPLIER from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @FORM31NO = D28_FORM31_NO from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select TOP 1 @FINYEAR = D27_FIN_YEAR from HSCP_DETAIL_CSV where HSCP_FILE_NAME = @HSCP_FILE_NAME

select @AvgD19 = avg(D16_BASIC_PART_COST)from HSCP_DETAIL_CSV group by D26_INVOICE_NO , HSCP_FILE_NAME having HSCP_FILE_NAME = @HSCP_FILE_NAME

select @SumD16 = sum(D16_BASIC_PART_COST)from HSCP_DETAIL_CSV group by D26_INVOICE_NO , HSCP_FILE_NAME having HSCP_FILE_NAME = @HSCP_FILE_NAME

select @SumD24 = sum(D24_EXCISE_AMOUNT)from HSCP_DETAIL_CSV group by D26_INVOICE_NO , HSCP_FILE_NAME having HSCP_FILE_NAME = @HSCP_FILE_NAME

select @RoundD24 = round (sum(D24_EXCISE_AMOUNT),0) from HSCP_DETAIL_CSV group by D26_INVOICE_NO , HSCP_FILE_NAME having HSCP_FILE_NAME = @HSCP_FILE_NAME

select @RoundD16 = round (sum(D16_BASIC_PART_COST),0) from HSCP_DETAIL_CSV group by D26_INVOICE_NO , HSCP_FILE_NAME having HSCP_FILE_NAME = @HSCP_FILE_NAME


select @RoundD21 = round (sum(D21_PURCHASE_COST),0) from HSCP_DETAIL_CSV group by D26_INVOICE_NO , HSCP_FILE_NAME having HSCP_FILE_NAME = @HSCP_FILE_NAME




INSERT INTO MAIN_OE_HEADER ( PLANT_CD , NEW_SUPP_CD , NEW_SUPP_LOC , SUPP_LOC_PROV_STAT , SUPP_INVOICE_DT , NEWINVOICENO , PART_RCV_DT , PART_DESC , SALES_TAX_RATE ,

INVENTORY , TOTAL_EXCISE , TOTAL_EXCISE1 , INVENTORY_NEW , TOTAL_EXCISE_NEW , SALES_TAX_NEW , TOTAL_INVOICE_AMT , STATUS , OE_INVOICE_NUM , FORM31NO , FINYEAR , OEFILE

, VATFILE) VALUES
(@PLANT_CD , @NEW_SUPP_CD , @NEW_SUPP_LOC , @SUPP_LOC_PROV_STAT , @SUPP_INVOICE_DT , @NEWINVOICENO , @PART_RCV_DT , 'AUTOPARTS' , @AvgD19 , @SumD16 , @SumD24 ,

@RoundD24 , @RoundD16 , @RoundD24 , 10 , @RoundD21 , 0 , @OE_INVOICE_NUM , @FORM31NO , @FINYEAR , @OEFILE , @VATFILE )











End
GO





This Frontant to call the Procedure

con.Open();
cmd=new sqlCammadn();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "ReadInsert";
cmd.Parameters.Add("@HSCP_FILE_NAME", SqlDbType.Char,50).Value = FileName;
cmd.ExecuteNonQuery();
con.Close();
sr.Close();




Error Generate is like below:-


The SqlParameterCollection only accepts non-null SqlParameter type objects, not String objects.

Please help to resolve this problem...