Request Error

can't read "DOC_INDEX": no such variable
    while executing
"sb_get_table_description DR$DOC_INDEX$I"
    ("eval" body line 1)
    invoked from within
"eval $tcl_statement"
    (procedure "util_memoize" line 11)
    invoked from within
"util_memoize "sb_get_table_description $table_name""
    invoked from within
"if { [exists_and_not_null table_name] } {
    append page_content [util_memoize "sb_get_table_description $table_name"]
} else {
    set table_name ""..."
    (file "/web/cyrano/www/doc/schema-browser/index.tcl" line 43)
    invoked from within
"source [ad_conn file]"
    (procedure "rp_handle_tcl_request" line 2)
    invoked from within
"rp_handle_tcl_request"
    invoked from within
"catch $handler error"
    invoked from within
"rp_abstract_url_server"

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