PLS-00703: multiple instances of named argument in list

I am getting this error when caling an Oracle stored procedure. The call is inside a foreach (DataRow dataRow in tempTable.Rows) loop and the first record updates fine, but on the second call, I get the error so I'm guessing I'm not releasing something. Can someone suggect something for this?

Remember its blowing on the second record.

foreach (DataRow dataRow in tempTable.Rows)
 {
      DO STUFF ......
 
    cmd.CommandText = "USER_TABLE_UPDATE";
    cmd.CommandType = CommandType.StoredProcedure;
     OracleParameter parameter0 = new OracleParameter();
     parameter0.ParameterName = "RESULT";
     parameter0.OracleType = OracleType.VarChar;
     parameter0.Direction = ParameterDirection.Output;
 
    parameter0.Size = 30;
    cmd.Parameters.Add(parameter0);
    cmd.Parameters.Add(new OracleParameter("pACTION", OracleType.VarChar)).Value = "update";
   cmd.Parameters.Add(new OracleParameter("pUSERID", OracleType.VarChar)).Value = userid;
   cmd.Parameters.Add(new OracleParameter("pFIRST_NAME", OracleType.VarChar)).Value = fname;
    cmd.Parameters.Add(new OracleParameter("pLAST_NAME", OracleType.VarChar)).Value = lname;
    cmd.Parameters.Add(new OracleParameter("pEMAIL", OracleType.VarChar)).Value = email;
    cmd.Parameters.Add(new OracleParameter("pPHONE", OracleType.VarChar)).Value = phone;
    cmd.Parameters.Add(new OracleParameter("pJOB_LEVEL_ID", OracleType.VarChar)).Value = job_lev;
    cmd.Parameters.Add(new OracleParameter("pMANAGER_DN", OracleType.VarChar)).Value = mgr_dn;
   int int_ins = cmd.ExecuteNonQuery();
 
TOP OF STORED PROCEDURE
 
CREATE OR REPLACE PROCEDURE OISWEB.USER_TABLE_UPDATE(RESULT	 OUT VARCHAR2,
 pACTION   VARCHAR2,
pUSERID 	   USERS.USER_ID %TYPE,
pFIRST_NAME  VARCHAR2,
pLAST_NAME   VARCHAR2,
pEMAIL	   VARCHAR2,
 pPHONE	   VARCHAR2,
 pJOB_LEVEL_ID	 USERS_EXT.JOB_LEVEL_ID%TYPE,
 pMANAGER_DN	 USERS_EXT.MANAGER_DN%TYPE
)

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