Would like to know what is the problem in my sql statement - Mailing list pgsql-sql

Please tell me why it says no value specified for parameter 1.

HashMap<Integer, ArrayList<String>> tutorSubject = new HashMap<Integer, ArrayList<String>>();

String sql1 = "select tutor_id, subject_name from tutor_subject where subject_name in ("
                                                       + builder.deleteCharAt( builder.length() -1 ).toString() + ")";