Intermittent errors on advanced query

Getting the following, intermittently, on the advanced query page. Not
consistently reproduceable. Any hints/pointers would be greatly appreciated.

error: RT::Attribute::Name Unimplemented in RT::Attributes.
(/usr/lib/perl5/vendor_perl/5.8.6/RT/Attributes_Overlay.pm line 81)
context:

492: else {
493: my ( $package, $filename, $line );
494: ( $package, $filename, $line ) = caller;
495:
496: die “$AUTOLOAD Unimplemented in $package. ($filename line $line) \n”;
497: }
498:
499: }
500:

code stack:
/usr/lib/perl5/vendor_perl/5.8.6/DBIx/SearchBuilder/Record.pm:496
/usr/lib/perl5/vendor_perl/5.8.6/RT/Attributes_Overlay.pm:81
/usr/lib/perl5/vendor_perl/5.8.6/RT/Attributes_Overlay.pm:73
/usr/lib/perl5/vendor_perl/5.8.6/RT/Attributes_Overlay.pm:88
/usr/lib/perl5/vendor_perl/5.8.6/RT/Attributes_Overlay.pm:119
/var/www/rt3/Search/Elements/SelectSearchesForObjects:58
/var/www/rt3/Search/Elements/EditSearches:75
/var/www/rt3/Search/Build.html:99
/var/www/rt3/autohandler:215
raw error

Rich Bowen, '92
Web Database Programmer
rbowen@asbury.edu