Forum OpenACS CMS: Problems with OpenACS causing site to crash!

I just started working on OpenACS a few weeks ago and so far I am getting a weird error that I think keeps crashing my virtual server.

PAGE: /packages/dotlrn/lib/toolbar
------------------------------------------------------------
can't read "dotlrn_admin_url": no such variable
    while executing
"lang::util::localize ${dotlrn_admin_url}"
    invoked from within
"if {[string equal "[ad_quotehtml [lang::util::localize ${admin_sw}]]" "1"]} {
append __adp_output "
    <tr>
        <td width=\"100%\" valign=\"top\" align=\"..."
    ("uplevel" body line 53)
    invoked from within
"uplevel {
set __adp_output ""
append __adp_output "<div id=\"dotlrn-toolbar\">
<table cellspacing=\"0\" cellpadding=\"0\" width=\"100%\" border=\"0\" ..."
    (procedure "template::code::adp::/home/yabt/yabt/packages/dotlrn/lib/too..." line 2)
    invoked from within
"template::code::${template_extension}::$__adp_stub"
    (procedure "template::adp_parse" line 77)
    invoked from within
"template::adp_parse [template::util::url_to_file "/packages/dotlrn/lib/toolbar" "$__adp_stub"] [list]"
[/code]
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Also whenever I try to delete the Menu-msgs nav links the links still appear and nothing happens. It only changes if I input a different link or name, but I just want to get rid of the links.

Well I just started working on this site. I have no made any changes to the code or deleted anything in the packages. Is there something I should add or remove to get rid of this error?

Well I'm really new to this, but it's dotlrn 2.1.1 and I also have another problem trying to remove links from my navigation. I am using menu-msgs and whenever I remove a key message the link still shows up. It only changes when I rename the link or use a different one.

Well the thing is I did not install this. I have only just started working on the site. So I think this error has been here for awhile from the previous webmaster or so.