Question Upgrade from RC1 to RC2 fails with a white screen

Just after clicking the update screen I get a white screen.

This is in the error log
PHP Fatal error: Class 'DOMDocument' not found in /var/www/html/home/administrator/components/com_kunena/install/schema.php on line 192,

Now each time I go into the admin for Kunena I see the screen attached, each time an additional line of
"Prepare Installation ... OK " appears. and if I click next the same php error comes up.

Was hoping someone had some ideas of what this php error is and how to work around it.

thanks

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

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

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 1900 seconds | Max execution memory: 50M | Max file upload: 90M

Kunena version detailled: Installed version: 1.6.0-RC1 | Build: 3173 | Version name: Kujadili | Kunena detailled configuration:

Warning: Spoiler!

[th]Kunena config settings:[/th]

board_title	Members Forum
board_offline	0
board_ofset	0
offline_message	<h2>The Forum is currently offline for maintenance.</h2> <div>Check back soon!</div>
enablerss	1
enablepdf	1
threads_per_page	20
messages_per_page	15
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
jmambot	0
disemoticons	0
template	default
showannouncement	0
avataroncat	0
catimagepath	category_images/
showchildcaticon	1
annmodid	62
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	0
useredit	1
useredittime	500
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	1
changename	0
pubwrite	0
floodprotection	0
mailmod	1
mailadmin	1
captcha	0
mailfull	1
allowavatar	1
allowavatarupload	0
allowavatargallery	0
imageprocessor	gd2
avatarquality	65
avatarsize	2048
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	0
avatar_src	cb
fb_profile
pm_component
userlist_rows	30
userlist_online	1
userlist_avatar	0
userlist_name	0
userlist_username	1
userlist_posts	1
userlist_karma	0
userlist_email	0
userlist_usertype	0
userlist_joindate	0
userlist_lastvisitdate	0
userlist_userhits	0
latestcategory	0
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	1
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
usernamechange	0
rules_infb	0
rules_cid	0
rules_link	www.kunena.com/
help_infb	0
help_cid	1
help_link	www.kunena.com/
showspoilertag	1
showvideotag	0
showebaytag	0
trimlongurls	1
trimlongurlsfront	20
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
fbsessiontimeout	1800
highlightcode	1
rss_type	post
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_word_count	0
rss_old_titles	1
fbdefaultpage	categories
default_sort	asc
alphauserpoints	0
alphauserpointsrules	0
alphauserpointsnumchars	0
sef	1
sefcats	1
sefutf8	0
showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	1
pollenabled	0
poppollscount	5
showpoppollstats	0
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
maxpersotext	50
ordering_system	old_ord
post_dateformat	ago
post_dateformat_hover	datetime
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	none
integration_activity	communitybuilder
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	1
onlineusers	1
debug	0
catsautosubscribed	0
showbannedreason	0
version_check	1
showthankyou	0
showpopthankysoustats	0
popthankscount	5
mod_see_deleted	0

Hello,

This last time, this issue is more present, you need to enable the support of DOM by php itself, maybe to your hoster if can do this.

Awesome thanks for the very timely response, worked like a charm.