Software error:

$ perl ./hist2rss.pl
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x87edcb4 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x87e55bc at /home/user/lib/modules/Class/DBI.pm line 1127.
<h1>Software error:</h1>
<pre>MyApp::Sets can't SELECT id, id, setnumber, setrev, name, theme, year, pcs, figs, picture, msrp, instructions, inventory
FROM   SETS
WHERE  ( ID = ? )
: Not an ARRAY reference at /home/user/lib/modules/Class/DBI.pm line 1126.
 at /home/user/lib/modules/Class/DBI/AbstractSearch.pm line 32

##</code><code>##

$ perl -d ./hist2rss.pl

Loading DB routines from perl5db.pl version 1.23
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(./hist2rss.pl:15):       my $db = new MyApp::DB;
  DB<1> c
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x88044c0 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c47508 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c62818 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c62174 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c629f8 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c62b00 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c650d8 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c65294 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c65c6c at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c66c24 at /home/user/lib/modules/Class/DBI.pm line 1127.
hist2rss.pl: Attempt to free unreferenced scalar: SV 0x8c65ec4 at /home/user/lib/modules/Class/DBI.pm line 1127.
Debugged program terminated.  Use q to quit or R to restart,
  use O inhibit_exit to avoid stopping after program termination,
  h q, h R or h O to get additional info.  
  DB<1> exit