statement-level statistics are disabled error (postgresql.conf)

Do you know what I did wrong?
I'm trying to enable some logging features in postgresql.conf, but now I
get this message when I try to connect to the postgresql server...

WARNING: statement-level statistics are disabled because parser,
planner, or executor statistics are on
psql: FATAL: invalid cache id: 30

These are some of the features I've turned on:
#-----------------------------------------------------------------------
----
# RUNTIME STATISTICS
#-----------------------------------------------------------------------
----

# - Statistics Monitoring -

log_parser_stats = true
log_planner_stats = true
log_executor_stats = true
log_statement_stats = true

# - Query/Index Statistics Collector -

stats_start_collector = true
stats_command_string = true
stats_block_level = true
stats_row_level = true
stats_reset_on_server_start = true

thank you!

Troy Campano