Forum OpenACS Development: Error in Xowiki - unable to dispatch method 'get_payload'

::4866836: unable to dispatch method 'get_payload'
while executing
"::[my folder_id] get_payload $attribute"
(procedure "get_parameter" line 5)
::4866810 ::xowiki::Package->get_parameter
invoked from within
"my get_parameter security_policy ::xowiki::policy1"
(procedure "init" line 6)
::4866810 ::xowiki::Package->init
::xowiki::Package ::xotcl::Class->create
invoked from within
"my create ::$package_id -url $url"
(procedure "require" line 8)
::xowiki::Package ::xo::PackageMgr->require
invoked from within
"my require -url $url $package_id"
(procedure "initialize" line 21)
::xowiki::Package ::xo::PackageMgr->initialize
invoked from within
"::xowiki::Package initialize -ad_doc {