Admin page gives HTTP ERROR 500

[Victor_Maxx]

Hello,
After succesfull installing fop2 on Ubuntu 18.x server gives us an error opening the 'Admin' page in the webbrowser, the 'fop2' site is accessable and working fine. If I browse to http://<IP_address_Ubuntu_svr>/fop2/admin the webrowser returns the 'HTTP ERROR 500' and in the Apache2 Errorlog a error is appended with these lines:
[Tue Oct 01 00:09:38.698443 2019] [mpm_prefork:notice] [pid 860] AH00163: Apache/2.4.29 (Ubuntu) configured -- resuming normal operations
[Tue Oct 01 00:09:38.702288 2019] [core:notice] [pid 860] AH00094: Command line: '/usr/sbin/apache2'
[Tue Oct 01 17:09:27.927268 2019] [php7:error] [pid 37838] [client 192.168.1.11:49407] PHP Fatal error: Uncaught Error: Call to undefined function simplexml_load_file() in /var/www/html/fop2/admin/system.php:385\nStack trace:\n#0 /var/www/html/fop2/admin/index.php(6): require_once()\n#1 {main}\n thrown in /var/www/html/fop2/admin/system.php on line 385

Can anyone explain me what's wrong?
Thanks,
Victor

[nicolas]

Hi,
You must install the php-xml module or similar, not sure how it is named in Ubuntu. After installing, restart the web server and try again.

Best regards,

[Victor_Maxx]

Hello Nicolas,
Spot on! Works like charm.. thanks again for the support for this amazing program!
Best regards
Victor