Request Error

can't read "revision_id": no such variable
    while executing
"list wg_get_article_body $revision_id"
    invoked from within
"util_memoize [list wg_get_article_body $revision_id] $cache_time_long"
    invoked from within
"set content [util_memoize [list wg_get_article_body $revision_id] $cache_time_long]"
    ("uplevel" body line 112)
    invoked from within
"uplevel {
    	  set cache_time_long 0

set db [ns_db gethandle]

#
# are we previewing?
#
if { $preview >= 1 } {

    # make sure we don't cache anyt..."
    (procedure "code::tcl::/web/wgbh/www/wgbh/elements/playlist_details" line 2)
    invoked from within
"code::tcl::$__adp_stub"
    invoked from within
"if { [file exists $__adp_stub.tcl] } {

      # ensure that data source preparation procedure exists and is up-to-date
      adp_init tcl $__adp_stub
..."
    ("uplevel" body line 3)
    invoked from within
"uplevel {

    if { [file exists $__adp_stub.tcl] } {

      # ensure that data source preparation procedure exists and is up-to-date
      adp_init t..."
    (procedure "adp_prepare" line 3)
    invoked from within
"adp_prepare "
    (procedure "template::adp_parse" line 31)
    invoked from within
"template::adp_parse [template::util::url_to_file "/www/wgbh/elements/playlist_details" "$__adp_stub"] [list program_id "${program_id}" episode_id "${e..."
    invoked from within
"append __adp_output [template::adp_parse [template::util::url_to_file "/www/wgbh/elements/playlist_details" "$__adp_stub"] [list program_id "${program..."
    ("uplevel" body line 23)
    invoked from within
"uplevel {
    	  set __adp_output ""

    set __adp_master [template::util::url_to_file "/www/wgbh/elements/template-nobanner" "$__adp_stub"]
append _..."
    (procedure "template::code::adp::/web/wgbh/www/wgbh/playlists/playlist" line 2)
    invoked from within
"template::code::${template_extension}::$__adp_stub"
    (procedure "template::adp_parse" line 58)
    invoked from within
"template::adp_parse [file root [ad_conn file]] {}"
    (procedure "adp_parse_ad_conn_file" line 7)
    invoked from within
"$handler"
    ("uplevel" body line 2)
    invoked from within
"uplevel $code"
    invoked from within
"ad_try {
	$handler
      } ad_script_abort val {
	# do nothing
      }"
    invoked from within
"rp_serve_concrete_file [ad_conn file]"
    (procedure "rp_serve_abstract_file" line 60)
    invoked from within
"rp_serve_abstract_file "$root/$path""
    ("uplevel" body line 2)
    invoked from within
"uplevel $code"
    invoked from within
"ad_try {
	rp_serve_abstract_file "$root/$path"
	set tcl_url2file([ad_conn url]) [ad_conn file]
	set tcl_url2path_info([ad_conn url]) [ad_conn path_inf..."

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