got an error while searching for a keyword

https://wiki.contextgarden.net/index.php?title=Special%3ASearch&search=placebuffer&go=Go



[966e839e01d0a232c888254a] 
/index.php?title=Special%3ASearch&search=placebuffer&go=Go 
Wikimedia\Rdbms\DBQueryError from line 1457 of 
/var/www/contextgarden.net/newwiki/htdocs/includes/libs/rdbms/database/Database.php:
 A database query error has occurred. Did you forget to run your application's 
database schema updater after upgrading?
Query: SHOW GLOBAL VARIABLES LIKE 'ft\_min\_word\_len'
Function: SearchMySQL::minSearchLength
Error: 1682 Native table 'performance_schema'.'global_variables' has the wrong 
structure (localhost)
Backtrace:

#0 
/var/www/contextgarden.net/newwiki/htdocs/includes/libs/rdbms/database/Database.php(1427):
 Wikimedia\Rdbms\Database->makeQueryException(string, integer, string, string)
#1 
/var/www/contextgarden.net/newwiki/htdocs/includes/libs/rdbms/database/Database.php(1200):
 Wikimedia\Rdbms\Database->reportQueryError(string, integer, string, string, 
boolean)
#2 
/var/www/contextgarden.net/newwiki/htdocs/includes/search/SearchMySQL.php(446): 
Wikimedia\Rdbms\Database->query(string, string)
#3 
/var/www/contextgarden.net/newwiki/htdocs/includes/search/SearchMySQL.php(402): 
SearchMySQL->minSearchLength()
#4 
/var/www/contextgarden.net/newwiki/htdocs/includes/search/SearchMySQL.php(104): 
SearchMySQL->normalizeText(string)
#5 
/var/www/contextgarden.net/newwiki/htdocs/includes/search/SearchMySQL.php(299): 
SearchMySQL->parseQuery(string, boolean)
#6 
/var/www/contextgarden.net/newwiki/htdocs/includes/search/SearchMySQL.php(273): 
SearchMySQL->queryMain(array, string, boolean)
#7 
/var/www/contextgarden.net/newwiki/htdocs/includes/search/SearchMySQL.php(188): 
SearchMySQL->getQuery(string, boolean)
#8 
/var/www/contextgarden.net/newwiki/htdocs/includes/search/SearchMySQL.php(178): 
SearchMySQL->searchInternal(string, boolean)
#9 
/var/www/contextgarden.net/newwiki/htdocs/includes/specials/SpecialSearch.php(318):
 SearchMySQL->searchTitle(string)
#10 
/var/www/contextgarden.net/newwiki/htdocs/includes/specials/SpecialSearch.php(185):
 SpecialSearch->showResults(string)
#11 
/var/www/contextgarden.net/newwiki/htdocs/includes/specialpage/SpecialPage.php(522):
 SpecialSearch->execute(NULL)
#12 
/var/www/contextgarden.net/newwiki/htdocs/includes/specialpage/SpecialPageFactory.php(568):
 SpecialPage->run(NULL)
#13 /var/www/contextgarden.net/newwiki/htdocs/includes/MediaWiki.php(288): 
SpecialPageFactory::executePath(Title, RequestContext)
#14 /var/www/contextgarden.net/newwiki/htdocs/includes/MediaWiki.php(861): 
MediaWiki->performRequest()
#15 /var/www/contextgarden.net/newwiki/htdocs/includes/MediaWiki.php(524): 
MediaWiki->main()
#16 /var/www/contextgarden.net/newwiki/htdocs/index.php(42): MediaWiki->run()
#17 {main}

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