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PHP fatal error on beta cluster
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Steps to reproduce:

"If you report this error to the Wikimedia System Administrators, please include the details below."

PHP fatal error:
Uncaught Error: Call to undefined method Diff\Differ\MapDiffer::setComparisonCallback() in /srv/mediawiki/php-master/extensions/WikibaseLexeme/src/Domain/Diff/LexemeDiffer.php:57

Stack trace:
#0 /srv/mediawiki/php-master/extensions/WikibaseLexeme/WikibaseLexeme.entitytypes.php(71): Wikibase\Lexeme\Domain\Diff\LexemeDiffer->__construct()
#1 [internal function]: Wikibase\Lexeme\WikibaseLexemeHooks::{closure}()
#2 /srv/mediawiki/php-master/extensions/Wikibase/client/includes/WikibaseClient.php(1350): call_user_func(Object(Closure))
#3 /srv/mediawiki/php-master/extensions/Wikibase/client/includes/WikibaseClient.php(1338): Wikibase\Client\WikibaseClient->getEntityDiffer()
#4 /srv/mediawiki/php-master/extensions/Wikibase/client/includes/WikibaseClient.php(674): Wikibase\Client\WikibaseClient->getEntityChangeFactory()
#5 /srv/mediawiki/php-master/extensions/Wikibase/client/includes/WikibaseClient.php(1320): Wikibase\Client\WikibaseClient->getStore()
#6 /srv/mediawiki/php-master/extensions/Wikibase/client/includes/Ho

Tested a few:
Does not occur on deploymentwiki or beta hewiktionary - don't have wikidata set up?
beta loginwiki returns 403 Forbidden Forbidden You don't have permission to access this resource. - could be a different issue?

Event Timeline

DannyS712 created this task.Jan 8 2020, 6:17 AM
Restricted Application added projects: Wikidata, User-DannyS712. · View Herald TranscriptJan 8 2020, 6:17 AM
Restricted Application added a subscriber: Liuxinyu970226. · View Herald TranscriptJan 8 2020, 6:18 AM
DannyS712 updated the task description. (Show Details)Jan 8 2020, 6:22 AM
DannyS712 moved this task from Unsorted to Reports on the User-DannyS712 board.
DannyS712 added a subscriber: Reedy.Jan 8 2020, 6:45 AM

@Reedy can I ask why was abandoned? It looks (at a preliminary glance) like it would fix this

Reedy closed this task as Resolved.Jan 8 2020, 8:41 AM
Reedy claimed this task.
Cutmuetia1998 set Due Date to Jan 11 2020, 5:00 PM.Jan 11 2020, 8:16 PM