ERROR [07001] [Oracle][ODBC][Ora]ORA-01008: not all variables bound

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VB

Each time I run this code I get this error from oracle "ERROR [07001] [Oracle][ODBC][Ora]ORA-01008: not all variables bound". Can I get some help please
This is my code below

Function addrecord() As Boolean
Dim db As New hospital 'establishing a connection by declaring an instance of the connection
Dim cmd As New OdbcCommand
cmd.Connection = db.connection
cmd.CommandText = "insert into STAFFS values (?,?)" 'telling the compiler you will pass parameters of the table item at runtime
cmd.CommandType = CommandType.Text


cmd.Parameters.AddWithValue("", username) 'telling the complier the values of the ?
cmd.Parameters.AddWithValue("", password)
Return cmd.ExecuteNonQuery() > 0 'executing the code
End Function