SQL Statement Missing From Log

Dear Helpful People,

I'm getting a bunch of:

2008-10-25 14:36:59 PDT ERROR: syntax error at or near "SET" at character 9
2008-10-25 14:36:59 PDT ERROR: syntax error at or near "fetch" at
character 9
2008-10-25 14:36:59 PDT ERROR: current transaction is aborted, commands
ignored until end of transaction block

With no idea where the "SET" is coming from. My logging configuration
is as follows. What am I doing wrong? How can I get the full failing
SQL statement?

# grep "log_" postgresql.conf | grep -v "^#"
log_min_messages = notice # =notice Values, in order of
decreasing detail:
log_error_verbosity = verbose # =default terse, default, or
verbose messages
log_min_duration_statement = 250 # -1 is disabled, 0 logs all
statements
log_line_prefix = '%t ' # Special values:
debug_pretty_print =on # = off