Rails - Nov 2010 - simple SQLITE3 error!!??library routine called out of sequence

Hi, dear guys!
I have following super simple program
dbh=DBI.connect("DBI:SQLite3:barron.db")
sth=dbh.prepare("INSERT INTO WORDS VALUES(?,?,?)")

3.times{
	sth.execute("1","2","3")
}

and it gives me error :
/Users/tsdeng/.rvm/gems/ruby-1.8.7-p302/gems/sqlite3-ruby-1.3.1/lib/sqlite3/statement.rb:41:in
`bind_param'': library routine called out of sequence
(SQLite3::MisuseException)
	from
/Users/tsdeng/.rvm/gems/ruby-1.8.7-p302/gems/sqlite3-ruby-1.3.1/lib/sqlite3/statement.rb:41:in
`bind_params''
	from
/Users/tsdeng/.rvm/gems/ruby-1.8.7-p302/gems/sqlite3-ruby-1.3.1/lib/sqlite3/statement.rb:37:in
`each''
	from
/Users/tsdeng/.rvm/gems/ruby-1.8.7-p302/gems/sqlite3-ruby-1.3.1/lib/sqlite3/statement.rb:37:in
`bind_params''
	from
/Users/tsdeng/.rvm/gems/ruby-1.8.7-p302/gems/dbd-sqlite3-1.2.5/lib/dbd/sqlite3/statement.rb:71:in
`bind_params''
	from
/Users/tsdeng/.rvm/gems/ruby-1.8.7-p302/gems/dbi-0.4.5/lib/dbi/handles/statement.rb:115:in
`execute''
	from words.rb:53
	from words.rb:49:in `each''
	from words.rb:49




I can avoid this error by not using prepared statement. But I want to use it!!! 
T_T



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