Symptoms
The following error message occurs during moodle upgrade attempt whether it be on command line or admin back end:
# php moodle/admin/cli/upgrade.php Default exception handler: Exception - Call to undefined function xml_parser_create() Debug: Error code: generalexceptionmessage * line 76 of /lib/xmlize.php: Error thrown * line 307 of /lib/environmentlib.php: call to xmlize() * line 355 of /lib/environmentlib.php: call to load_environment_xml() * line 101 of /lib/environmentlib.php: call to get_latest_version_available() * line 116 of /admin/cli/upgrade.php: call to check_moodle_environment() !!! Exception - Call to undefined function xml_parser_create() !!! !! Error code: generalexceptionmessage !! !! Stack trace: * line 76 of /lib/xmlize.php: Error thrown * line 307 of /lib/environmentlib.php: call to xmlize() * line 355 of /lib/environmentlib.php: call to load_environment_xml() * line 101 of /lib/environmentlib.php: call to get_latest_version_available() * line 116 of /admin/cli/upgrade.php: call to check_moodle_environment() !!
Solution
Your system is missing php XML library. Install a relevant XML php package for your distribution and PHP version. For example on Ubuntu 16.04 Xenial Xerus with the Apache webserver run:
# apt-get install php7.0-xml # service apache2 restart
Re-attempt the moodle upgrade:
# php moodle/admin/cli/upgrade.php == Upgrading Moodle database from version 3.1 (Build: 20160523) (2016052300) to 3.1+ (Build: 20160603) (2016052300.02) == Your Moodle files have been changed, and you are about to automatically upgrade your server to this version: 3.1+ (BUILD: 20160603) (2016052300.02) Once you do this you can not go back again. Please note that this process can take a long time. Are you sure you want to upgrade this server to this version? type y (means yes) or n (means no) : y -->System ++ Success ++
