Forum .LRN Q&A: Problems with Assessment package

Hello everybody:

I have a problem during the installation of Assessment package; I follow all the steps for the installation of the package, but when I mount the package it crush, and I receive the follow message:

Server Error

There was a server error processing your request. We apologize.

Here is a detailed dump of what took place at the time of the error, which may assist a programmer in tracking down the problem:

invalid command name "content::folder::get_folder_from_package"
while executing
"content::folder::get_folder_from_package -package_id $package_id"
(procedure "as::assessment::folder_id" line 3)
invoked from within
"as::assessment::folder_id -package_id $package_id"
invoked from within
"set folder_id [as::assessment::folder_id -package_id $package_id]"
("uplevel" body line 17)
invoked from within
"uplevel {
ad_page_contract {

Lists all the assessments that can be taken and their sessions.

@author Eduardo Pérez Ureta (mailto:eperez@it.uc3m.e...";
(procedure "code::tcl::/var/lib/aolserver/openacs/packages/assessment/ww..." 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 2)
invoked from within
"adp_prepare "
(procedure "template::adp_parse" line 30)
invoked from within
"template::adp_parse [file root [ad_conn file]] {}"
(procedure "adp_parse_ad_conn_file" line 5)
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..."

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I have grant permissions to all files, but still have the same error...