Update comand with gridview

Question

I get this error when trying to call the update stored procedure from the gridview event handler:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'MMAR_SP_APPLICATION_UPDATE'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

Stored proc:

CREATE OR REPLACE PROCEDURE RPT.MMAR_SP_Application_Update
(
   application_id_ IN MMAR_application.application_id%TYPE,
   name_ IN MMAR_application.name%type,
   lob_ IN mmar_application.lob%type,
   region_ IN mmar_application.region%type,
   cvscodelocation_ IN mmar_application.cvscodelocation%type,
   description_ IN mmar_application.description%type
)
AS
BEGIN
UPDATE MMAR_APPLICATION
SET 
   name=name_, 
   lob=lob_, 
   REGION=region_,
   CVSCODELOCATION=cvscodelocation_,
   DESCRIPTION=description_, 
   USER_UPDATED=USER, 
   DATE_UPDATED=SYSDATE 
   WHERE APPLICATION_ID = application_id_;
COMMIT;
END MMAR_SP_Application_Update;
C# Code:
protected void gvApplication_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
GridView gv = (GridView)sender;
GridViewRow gvr = (GridViewRow)gv.Rows[e.RowIndex];
TextBox temp = new TextBox();
Label tempLbl = new Label();
OracleConnection conn = new OracleConnection("Data Source=xxx;Persist Security Info=True;User ID=xxx;Password=xxx");
conn.Open();
OracleCommand cmd = new OracleCommand("MMAR_SP_APPLICATION_UPDATE", conn);
cmd.CommandType = CommandType.StoredProcedure;

OracleParameter prm6 = new OracleParameter("application_id_", OracleDbType.Int64);
prm6.Direction = ParameterDirection.Input;
tempLbl = (Label)gvr.FindControl("Label1");
prm6.Value = tempLbl.Text;
cmd.Parameters.Add(prm6);
OracleParameter prm1 = new OracleParameter("name_", OracleDbType.Varchar2);
prm1.Direction = ParameterDirection.Input;
temp = (TextBox)gvr.FindControl("Textbox1");
prm1.Value = temp.Text;
cmd.Parameters.Add(prm1);
 
OracleParameter prm2 = new OracleParameter("lob_", OracleDbType.Varchar2);
prm2.Direction = ParameterDirection.Input;
temp = (TextBox)gvr.FindControl("Textbox2");
prm2.Value = temp.Text;
cmd.Parameters.Add(prm2);
OracleParameter prm4 = new OracleParameter("region_", OracleDbType.Varchar2);
prm4.Direction = ParameterDirection.Input;
temp = (TextBox)gvr.FindControl("Textbox3");
prm4.Value = temp.Text;
cmd.Parameters.Add(prm4);
OracleParameter prm3 = new OracleParameter("cvscodelocation_", OracleDbType.Varchar2);
prm3.Direction = ParameterDirection.Input;
temp = (TextBox)gvr.FindControl("Textbox4");
prm3.Value = temp.Text;
cmd.Parameters.Add(prm3);
OracleParameter prm5 = new OracleParameter("description_", OracleDbType.Varchar2);
prm5.Direction = ParameterDirection.Input;
temp = (TextBox)gvr.FindControl("Textbox5");
prm5.Value = temp.Text;
cmd.Parameters.Add(prm5);
cmd.ExecuteNonQuery();
conn.Close();
gvApplication.DataBind();
}
 
Any idea why I keep getting this error no matter what I try?