Merged K3.0 installation fails with message "Warning: Invalid argument supplied for foreach() in ../administrator/components/com_kunena/install/schema.php on line 296"

Hi, tried to install K3.0.0 package on Joomla 3.1.1.
I got this output:

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Warning: DOMDocument::load() [domdocument.load]: I/O warning : failed to load external entity "/home/dpalio/elettrosmogsicilia.org/administrator/KPATH_ADMIN/install/install.xml" in /home/dpalio/elettrosmogsicilia.org/administrator/components/com_kunena/install/schema.php on line 206

Warning: Invalid argument supplied for foreach() in /home/dpalio/elettrosmogsicilia.org/administrator/components/com_kunena/install/schema.php on line 296

Fatal error: Class 'KunenaRoute' not found in /home/dpalio/elettrosmogsicilia.org/administrator/components/com_kunena/install/sql/install/php/sampledata.php on line 147

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When I pressed "details" I got just one row:
Preparare l'installazione ... OK
(I have the italian language installed)

When I opened the Component Menu, I could see Kunena listed among the components.
When I pressed Forum tools, I could see the installation bar progressing, taking up a few seconds (is that a normal behaviour).
Here follows the configuration report.

My question is: based on the configuration report below, is it safe to ignore the installation error and go ahead all the same? Or, is it safer to wait for a newer and more stable version? Can you please shed some light?
in other words: is the reported error really a fatal error? Any way to fix it?
Thank you.

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Database collation check: The collation of your table fields are correct

Joomla! SEF: Enabled | Joomla! SEF rewrite: Disabled | FTP layer: Disabled |

This message contains confidential information

htaccess: Missing | PHP environment: Max execution time: 30 seconds | Max execution memory: 90M | Max file upload: 7M

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path
164	Forum	kunenamenu	view=home&defaultmenu=166	forum
165	Indice delle categorie	kunenamenu	view=category&layout=list	forum/home
166	Discussioni recenti	kunenamenu	view=topics&mode=replies	forum/recente
167	Nuova discussione	kunenamenu	view=topic&layout=create	forum/nuovadiscussione
168	Senza risposta	kunenamenu	view=topics&mode=noreplies	forum/senzarisposte
169	Mie discussioni	kunenamenu	view=topics&layout=user&mode=default	forum/mierecenti
170	Profilo	kunenamenu	view=user	forum/profilo
171	Aiuto	kunenamenu	view=misc	forum/aiuto
172	Ricerca	kunenamenu	view=search	forum/cerca
173	Forum	mainmenu	Itemid=164	kunena-2013-06-18

Joomla default template details : protostar | author: Kyle Ledbetter | version: 1.0 | creationdate: Unknown

Kunena default template details : Blue Eagle 2.0 | author: Kunena Team | version: 3.0.0 | creationdate: 2013-05-15

Kunena version detailed: Kunena 3.0.0 | 2013-05-15 [ Wanga ]
| Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	6
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
disemoticons	0
template	blue_eagle
showannouncement	1
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	1
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	0
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	0
captcha	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	2048
imageheight	800
imagewidth	800
imagesize	150
filetypes	txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2
filesize	120
showranking	1
rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_name	1
userlist_posts	1
userlist_karma	1
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	1
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
usernamechange	0
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
rss_timelimit	month
rss_limit	100
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_author_format	name
rss_author_in_title	1
rss_word_count	0
rss_old_titles	1
rss_cache	900
defaultpage	recent
default_sort	asc
sef	1
showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	1
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
maxpersotext	50
ordering_system	mesid
post_dateformat	ago
post_dateformat_hover	datetime
hide_ip	1
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	1
debug	0
catsautosubscribed	0
showbannedreason	0
version_check	1
showthankyou	1
showpopthankyoustats	1
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
listcat_show_moderators	1
lightbox	1
show_list_time	720
show_session_type	0
show_session_starttime	0
userlist_allowed	0
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	1
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
captcha_post_limit	0
keywords	1
userkeywords	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	1
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	8
pickup_category	0
article_display	intro
send_emails	1
fallback_english	1
cache	1
cache_time	60
iptracking	1
rss_feedburner_url
autolink	1
access_component	1

| Kunena integration settings:

Warning: Spoiler!

Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
en-GB	English (United Kingdom)
it-IT	Italian (IT)

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: None

Hello,

The path in error message is weird : /home/dpalio/elettrosmogsicilia.org/administrator/KPATH_ADMIN/install/install.xml

So, do you have able to access to Kunena backend ?

Hello xillibit,
I agree it is weird: I do not know much PHP, however looks to me like the variable KPATH_ADMIN has not been properly resolved/expanded.

I can access the Kunena backend. As I reported, the first time I tried to access it, I got a completion progress bar that took a few seconds to become entirely green, I do not know whether this is the typical behavior or a direct consequence of the earlier fatal error. I subsequently could access all the 11 submenu entries of Kunena in Component Manager menu.

Based on the sampledata.php content and the reported error at line 147, what can you advise to me? Do you think it is relatively safe to continue using Kunena or I shall de-install it and fix something in the installation procedure before I start over again, or even wait for a future Kunena version?

Thank you.

If you can access to all functions with no issues, so don't worry

The installation failed with the following error:

Warning: Invalid argument supplied for foreach() in/home/sitr/public_html/administrator/components/com_kunena/install/schema.phpon line 296

Fatal error: Class 'KunenaRoute' not found in/home/sitr/public_html/administrator/components/com_kunena/install/sql/install/php/sampledata.phpon line 147


What can I do?

Use: Joomla 2.5.13 + PHP 5.3.26 + MySQL 5.1.70

I tried a second installation and now the component is installed correctly.
What is sucess in the first installation?