MediaWiki internal error.

Original exception: [4d5664ba] /t/index.php?title=Special:UserMerge/Tuxlover Exception from line 278 of /var/www/vhosts/amule.org/subdomains/wiki/t/includes/specialpage/SpecialPage.php:
Backtrace:
#0 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/specialpage/SpecialPage.php(290): SpecialPage->displayRestrictionError()
#1 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/specialpage/FormSpecialPage.php(163): SpecialPage->checkPermissions()
#2 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/specialpage/FormSpecialPage.php(139): FormSpecialPage->checkExecutePermissions(User)
#3 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/specialpage/SpecialPage.php(379): FormSpecialPage->execute(string)
#4 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/specialpage/SpecialPageFactory.php(503): SpecialPage->run(string)
#5 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/Wiki.php(285): SpecialPageFactory::executePath(Title, RequestContext)
#6 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/Wiki.php(588): MediaWiki->performRequest()
#7 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/Wiki.php(447): MediaWiki->main()
#8 /var/www/vhosts/amule.org/subdomains/wiki/t/index.php(46): MediaWiki->run()
#9 {main}

Exception caught inside exception handler: [d37e3e26] /t/index.php?title=Special:UserMerge/Tuxlover Exception from line 967 of /var/www/vhosts/amule.org/subdomains/wiki/t/includes/db/Database.php: DB connection error: php_network_getaddresses: getaddrinfo failed: Name or service not known (db1.szerverem.hu:3306)
Backtrace:
#0 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/db/LoadBalancer.php(754): DatabaseBase->reportConnectionError(string)
#1 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/db/LoadBalancer.php(477): LoadBalancer->reportConnectionError()
#2 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/GlobalFunctions.php(3662): LoadBalancer->getConnection(integer, array, boolean)
#3 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/parser/LinkHolderArray.php(284): wfGetDB(integer)
#4 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/parser/LinkHolderArray.php(261): LinkHolderArray->replaceInternal(string)
#5 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/parser/Parser.php(5056): LinkHolderArray->replace(string)
#6 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/parser/Parser.php(413): Parser->replaceLinkHolders(string)
#7 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/OutputPage.php(1552): Parser->parse(string, Title, ParserOptions, boolean, boolean, NULL)
#8 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/OutputPage.php(1494): OutputPage->addWikiTextTitle(string, Title, boolean, boolean, boolean)
#9 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/OutputPage.php(2250): OutputPage->addWikiText(string)
#10 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/exception/PermissionsError.php(55): OutputPage->showPermissionsErrorPage(array, string)
#11 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/exception/MWExceptionHandler.php(44): PermissionsError->report()
#12 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/exception/MWExceptionHandler.php(139): MWExceptionHandler::report(PermissionsError)
#13 /var/www/vhosts/amule.org/subdomains/wiki/t/includes/Wiki.php(454): MWExceptionHandler::handle(PermissionsError)
#14 /var/www/vhosts/amule.org/subdomains/wiki/t/index.php(46): MediaWiki->run()
#15 {main}