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Can't move [[mw:Talk:Wikibase/Beta Features/Other projects sidebar]]
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Description

@Jdforrester-WMF tried to move Talk:Wikibase/Beta_Features/Other_projects_sidebar to Talk:Beta_Features/Other_projects_sidebar (which according to the move log, Greg has already done!), but it failed with the following exception:

2015-08-12 18:01:19 mw1168 mediawikiwiki exception ERROR: [7d0c087d] /w/index.php?title=Special:MovePage&action=submit  
Flow\Exception\DataModelException from line 247 of /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/Index/FeatureIndex.php:
Unable to find specified offset in query results

[stacktrace]
#0 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/Index/FeatureIndex.php(195): Flow\\Data\\Index\\FeatureIndex->getOffsetFromKey(array, string)
#1 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/Index/FeatureIndex.php(492): Flow\\Data\\Index\\FeatureIndex->getOffsetLimit(array, array)
#2 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/Index/FeatureIndex.php(440): Flow\\Data\\Index\\FeatureIndex->filterResults(array, array)
#3 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/ObjectLocator.php(80): Flow\\Data\\Index\\FeatureIndex->findMulti(array, array)
#4 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/ObjectLocator.php(55): Flow\\Data\\ObjectLocator->findMulti(array, array)
#5 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Data/Pager/Pager.php(121): Flow\\Data\\ObjectLocator->find(array, array)
#6 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Block/TopicList.php(481): Flow\\Data\\Pager\\Pager->getPage(Closure$Flow\\Block\\TopicListBlock::getPage;2116714285)
#7 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Block/TopicList.php(268): Flow\\Block\\TopicListBlock->getPage(array)
#8 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/View.php(176): Flow\\Block\\TopicListBlock->renderApi(array)
#9 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/View.php(69): Flow\\View->buildApiResponse(Flow\\WorkflowLoader, array, string, array)
#10 /srv/mediawiki/php-1.26wmf18/extensions/Flow/includes/Content/BoardContent.php(191): Flow\\View->show(Flow\\WorkflowLoader, string)
#11 /srv/mediawiki/php-1.26wmf18/includes/page/WikiPage.php(2115): Flow\\Content\\BoardContent->getParserOutput(Title, integer, ParserOptions)
#12 /srv/mediawiki/php-1.26wmf18/includes/page/WikiPage.php(2164): WikiPage->prepareContentForEdit(Flow\\Content\\BoardContent, Revision, User)
#13 /srv/mediawiki/php-1.26wmf18/includes/MovePage.php(501): WikiPage->doEditUpdates(Revision, User, array)
#14 /srv/mediawiki/php-1.26wmf18/includes/MovePage.php(255): MovePage->moveToInternal(User, Title, string, boolean)
#15 /srv/mediawiki/php-1.26wmf18/includes/specials/SpecialMovepage.php(583): MovePage->move(User, string, boolean)
#16 /srv/mediawiki/php-1.26wmf18/includes/specials/SpecialMovepage.php(123): MovePageForm->doSubmit()
#17 /srv/mediawiki/php-1.26wmf18/extensions/Translate/tag/SpecialPageTranslationMovePage.php(135): MovePageForm->execute(NULL)
#18 /srv/mediawiki/php-1.26wmf18/includes/specialpage/SpecialPage.php(384): SpecialPageTranslationMovePage->execute(NULL)
#19 /srv/mediawiki/php-1.26wmf18/includes/specialpage/SpecialPageFactory.php(553): SpecialPage->run(NULL)
#20 /srv/mediawiki/php-1.26wmf18/includes/MediaWiki.php(249): SpecialPageFactory::executePath(Title, RequestContext)
#21 /srv/mediawiki/php-1.26wmf18/includes/MediaWiki.php(677): MediaWiki->performRequest()
#22 /srv/mediawiki/php-1.26wmf18/includes/MediaWiki.php(474): MediaWiki->main()
#23 /srv/mediawiki/php-1.26wmf18/index.php(41): MediaWiki->run()
#24 /srv/mediawiki/w/index.php(3): include(string)
#25 {main}

Note, this is an occupied page, which might be relevant.

Event Timeline

Catrope raised the priority of this task from to Needs Triage.
Catrope updated the task description. (Show Details)
Catrope added a project: StructuredDiscussions.
Catrope added subscribers: Catrope, Jdforrester-WMF.
Restricted Application added a subscriber: Aklapper. · View Herald Transcript

From logs:

https://www.mediawiki.org/w/index.php?title=Special%3ALog&type=delete&user=&page=Talk%3ABeta+Features%2FOther+projects+sidebar&year=&month=-1&tagfilter=

20:48, June 20, 2014 Greg (WMF) (talk | contribs | block) moved page Talk:Wikibase/Beta Features/Other projects sidebar to Talk:Beta Features/Other projects sidebar (moving to be under the normal Beta Features page) (revert)

20:43, August 3, 2015 Web0906400344 (talk | contribs | block) moved page Talk:Beta Features/Other projects sidebar to Talk:Lai0906400344@gmail.com (revert)

20:47, August 3, 2015 Nemo bis (talk | contribs | block) moved page Talk:Lai0906400344@gmail.com to Talk:Beta Features/Other projects sidebar over a redirect without leaving a redirect (revert)

18:01, August 12, 2015 Jdforrester (WMF) (talk | contribs | block) deleted Talk:Beta Features/Other projects sidebar (Deleted to make way for move from "Talk:Wikibase/Beta Features/Other projects sidebar") (view/restore)

So it looks like it was moved, deleted from the new location, then attempted to be moved again. But it's not clear which of those move/deletions were Flow content model (maybe none).

Pppery claimed this task.
Pppery subscribed.

I have no idea what happened here 9 years ago, but I just did the move myself and it worked, so resolving.