How to resolve exception : illegal variable name/number when calling a store procedure

See more:

ASP.NET

Oracle

Hi , Can anyone help me resolve above exception?
I am trying to import file and for that i have written Store Procedure , but when i call procedure it gives me above exception what is the reason and do i need to change the parameter name?

if (imp_module == "m_impbankmaster")
               {
                   //Call Procedure
                   try
                   {
                       s_dsnstr = o_Cls_Utility.utl_fnGetDSNStr(SessionCheck.s_sessiondpid);
                       OracleConnect o_Cls_OracleConnect = new OracleConnect(s_dsnstr);
                       o_Cls_OracleConnect.CallStoredProcedure_PreInit();
                       o_Cls_OracleConnect.CallStoredProcedure_Varchar2_AddParameters("cPath", parameter2);
                       o_Cls_OracleConnect.CallStoredProcedure_Varchar2_AddParameters("cFilename", parameter3);
                       o_Cls_OracleConnect.CallStoredProcedure_Varchar2_AddParameters("cUserName", parameter4);
                       int recordsInserted = o_Cls_OracleConnect.CallStoredProcedure("IMP_PKG.BANKMSTIMP");
                       o_Cls_OracleConnect.Dispose();
                   }
                   catch (Exception ex)
                   {
                       throw ex;
                   }
               }

Store Procedure :

CREATE OR REPLACE PROCEDURE imp_pkg.BankMstImp(cPath VARCHAR2,cFilename VARCHAR2,cUserName VARCHAR2)

I get exception on below line.

    int recordsInserted = o_Cls_OracleConnect.CallStoredProcedure("IMP_PKG.BANKMSTIMP");
                       o_Cls_OracleConnect.Dispose();