error to apply a template on courses

[linsharon]

Operating System: Debian GNU/Linux 10 (buster)

Apache: 2.4.38-3+deb10u7

PostgreSQL: 11+200+deb10u4

Moodle version: Moodle 3.11.4+ (Build: 20211223) | Version 2021051704.12 | Stable version

PHP version: PHP 7.3.31-1~deb10u1

Error Log:===============================================================================

[Mon May 16 14:58:36.557096 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] instantiating restore controller cf83b34c1ec8fe601be6b6fc9370d485, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.565303 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] setting controller status to 100, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.570299 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] loading backup info, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.572240 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] loading controller plan, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.576494 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] setting controller status to 300, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.577089 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] applying restore defaults, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.579306 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] Unknown setting: questionbank, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.580192 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] setting controller status to 400, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.580694 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] checking plan security, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.581232 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] setting controller status to 600, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.581684 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] saving controller to db, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.582239 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] calculating controller checksum 16b11b6a575dfd72216366c0e170b9ab, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.603596 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] loading controller from db, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.679821 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] setting controller status to 700, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.680432 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] saving controller to db, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.681145 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] calculating controller checksum 0424f1f0e235c0fe6f66008be37b7541, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.685748 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] loading controller from db, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304 [Mon May 16 14:58:36.844629 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] PHP Notice: Undefined index: self in /var/www/lms/lib/enrollib.php on line 1150, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304

[Mon May 16 14:58:36.845841 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] Default exception handler: Exception - Call to a member function allow_unenrol() on null Debug: \n Error code: generalexceptionmessage\n

• line 1150 of /lib/enrollib.php: Error thrown\n
• line ? of unknownfile: call to {closure}()\n
• line 1152 of /lib/enrollib.php: call to array_filter()\n
• line 5388 of /lib/moodlelib.php: call to enrol_course_delete()\n
• line 1843 of /backup/util/dbops/restore_dbops.class.php: call to remove_course_contents()\n
• line 382 of /backup/controller/restore_controller.class.php: call to restore_dbops::delete_course_content()\n
• line 123 of /course/format/kickstart/classes/course_importer.php: call to restore_controller->execute_plan()\n
• line 71 of /course/format/kickstart/classes/course_importer.php: call to format_kickstart\course_importer::import()\n
• line 40 of /course/format/kickstart/import.php: call to format_kickstart\course_importer::import_from_template()\n , referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304

[Mon May 16 14:58:36.898645 2022] [php7:notice] [pid 1534] [client 133.15.62.91:64175] Potential coding error - existing temptables found when disposing database. Must be dropped!, referer: https://my_moodle_instance/course/format/kickstart/confirm.php?template_id=4&course_id=1304

[linsharon]

This error only occurred for a list of previously created empty courses on their landing pages with a list of templates. No matter which template I chose they all led to error. However, such error did not happen when I create new courses today, and also not with those courses which templates were already applied.