Question [Topic closed for lack of interest] K 1.6.3: error when logging in and replying to topics

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

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htaccess: Exists | PHP environment: Max execution time: 120 seconds | Max execution memory: 64M | Max file upload: 25M

Joomla default template details : psiconet02 | author: Maurizio Brasini | version: 1.0 | creationdate: 2011-02-08

Kunena default template details : Argent(RC3 - stable) | author: Gonzaunit | version: 1.6.0 | creationdate: 2010-08-20

Kunena version detailled: Installed version: 1.6.3 | Build: 4344 | Version name: Parlare | Kunena detailled configuration:

Warning: Spoiler!

[th]Kunena config settings:[/th]

board_title	Domande e Risposte
board_offline	0
board_ofset	0
offline_message	<h2> Il forum è momentaneamente inattivo. <div>A presto!</div> </h2>
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messages_per_page_search	15
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template	Argentrc
showannouncement	1
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showchildcaticon	1
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rtewidth	300
rteheight	300
enableforumjump	1
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showemail	0
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showkarma	1
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allowfavorites	1
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maxsig	100
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mailadmin	1
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allowavatar	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	2000
allowimageupload	0
allowimageregupload	1
imageheight	800
imagewidth	800
imagesize	150
allowfileupload	0
allowfileregupload	1
filetypes	zip,txt,doc,gz,tgz
filesize	120
showranking	1
rankimages	1
avatar_src
fb_profile
pm_component
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_name	1
userlist_username	1
userlist_posts	1
userlist_karma	1
userlist_email	1
userlist_usertype	1
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userlist_lastvisitdate	1
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trimlongurlsfront	40
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rss_type	topic
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rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
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rss_old_titles	1
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fbdefaultpage	categories
default_sort	asc
alphauserpointsnumchars	100
sef	1
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showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	1
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polltimebtvotes	00:05:00
pollnbvotesbyuser	100
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ordering_system	replyid
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hide_ip	1
js_actstr_integration	0
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
integration_access	communitybuilder
integration_login	communitybuilder
integration_avatar	communitybuilder
integration_profile	communitybuilder
integration_private	communitybuilder
integration_activity	communitybuilder
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	1
onlineusers	1
debug	1
catsautosubscribed	0
showbannedreason	1
version_check	1
showthankyou	1
showpopthankyoustats	1
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
listcat_show_moderators	1
lightbox	1
activity_limit	0
show_list_time	720
show_session_type	0
show_session_starttime	0
userlist_allowed	0

Third-party components: AlphaUserPoints: Disabled or not installed | CommunityBuilder: Installed (Version : 1.3.1) | Jomsocial: Disabled or not installed | UddeIm: Disabled or not installed

Third-party SEF components: sh404sef: Disabled or not installed | ARTIO JoomSEF: Installed (Version : 3.7.6) | AceSEF: Disabled or not installed

Plugins: System - Mootools12: Disabled | System - Mootools Upgrade: Enabled | JFirePHP: Disabled or not installed | Kunena Discuss: Enabled (Version : 1.6.2) | Kunena Search: Enabled (Version : 1.6.2) | My Kunena Forum Menu: Disabled or not installed | My Kunena Forum Posts: Disabled or not installed

Modules: Kunena Latest: Enabled (Version : 1.6.2) | Kunena Stats: Disabled or not installed | Kunena Login: Disabled or not installed