statistics collector

I am having trouble getting statistics collector to go
When I add the lines

#
# Access statistics collection
#
stats_start_collector = true
stats_reset_on_server_start = true
stats_command_string = false
stats_row_level = false
stats_block_level = false

to my postgresql.conf file that did not previously exist there. and then
run /etc/rc.d/init.d/postgresql start the database enguine will not
start?

Do I need to install an RPM to use statistics collector with postgres.

I am running red hat linux version 7.2
and postgresql 7.2

This is my postgresql.conf file. I manually added the lines about access
statistics collection?

#
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form
#
# name = value
#
# (The `=' is optional.) White space is collapsed, comments are
# introduced by `#' anywhere on a line. The complete list of option
# names and allowed values can be found in the PostgreSQL
# documentation. Examples are:

#log_connections = on
#fsync = off
#max_connections = 64

# Any option can also be given as a command line switch to the
# postmaster, e.g., 'postmaster -c log_connections=on'. Some options
# can be set at run-time with the 'SET' SQL command.

#=======================================================================
=

#
# Connection Parameters
#
tcpip_socket = true
#ssl = false

#max_connections = 32 # 1-1024

#port = 5432
#hostname_lookup = false
#show_source_port = false

#unix_socket_directory = ''
#unix_socket_group = ''
#unix_socket_permissions = 0777

#virtual_host = ''

#krb_server_keyfile = ''

#
# Performance
#
#sort_mem = 512
#shared_buffers = 2*max_connections # min 16
#fsync = true

#
# Optimizer Parameters
#
#enable_seqscan = true
#enable_indexscan = true
#enable_tidscan = true
#enable_sort = true
#enable_nestloop = true
#enable_mergejoin = true
#enable_hashjoin = true

#ksqo = false
#geqo = true

#effective_cache_size = 1000 # default in 8k pages
#random_page_cost = 4
#cpu_tuple_cost = 0.01
#cpu_index_tuple_cost = 0.001
#cpu_operator_cost = 0.0025
#geqo_selection_bias = 2.0 # range 1.5-2.0

#
# GEQO Optimizer Parameters
#
#geqo_threshold = 11
#geqo_pool_size = 0 #default based in tables, range 128-1024
#geqo_effort = 1
#geqo_generations = 0
#geqo_random_seed = -1 # auto-compute seed

#
# Inheritance
#
#sql_inheritance = true

#
# Deadlock
#
#deadlock_timeout = 1000

#
# Expression Depth Limitation
#
#max_expr_depth = 10000 # min 10

#
# Write-ahead log (WAL)
#
#wal_buffers = 8 # min 4
#wal_files = 0 # range 0-64
#wal_sync_method = fsync # fsync or fdatasync or open_sync or
open_datasync
# Note: default wal_sync_method varies across platforms
#wal_debug = 0 # range 0-16
#commit_delay = 0 # range 0-100000
#commit_siblings = 5 # range 1-1000
#checkpoint_segments = 3 # in logfile segments (16MB each), min 1
#checkpoint_timeout = 300 # in seconds, range 30-3600

#
# Debug display
#
#silent_mode = false

log_connections = true
#log_timestamp = false
#log_pid = false

#debug_level = 0 # range 0-16

#debug_print_query = false
#debug_print_parse = false
#debug_print_rewritten = false
#debug_print_plan = false
#debug_pretty_print = false

#ifdef USE_ASSERT_CHECKING
#debug_assertions = true
#endif

#
# Syslog
#
#ifdef ENABLE_SYSLOG
syslog = 0 # range 0-2
#syslog_facility = 'LOCAL0'
#syslog_ident = 'postgres'
#endif

#
# Statistics
#
#show_parser_stats = true
#show_parser_stats = true
#show_planner_stats = true
#show_executor_stats = true
#show_query_stats = true
#ifdef BTREE_BUILD_STATS
#show_btree_build_stats = false
#endif

#
# Access statistics collection
#
#stats_start_collector = true
#stats_reset_on_server_start = true
#stats_command_string = false
#stats_row_level = false
#stats_block_level = false

#
# Lock Tracing
#
#trace_notify = false
#ifdef LOCK_DEBUG
#trace_locks = false
#trace_userlocks = false
#trace_spinlocks = false
#debug_deadlocks = false
#trace_lock_oidmin = 16384
#trace_lock_table = 0
#endif