Warning: mysqli::query(): (HY000/23): Out of resources when opening file './ar@002dwf_de_contao/tl_page.MYD' (Errcode: 24 - Too many open files) in system/modules/core/library/Contao/Database/Mysqli/Statement.php on line 81
#0 [internal function]: __error(2, 'mysqli::query()...', '/var/www/vhosts...', 81, Array)
#1 system/modules/core/library/Contao/Database/Mysqli/Statement.php(81): mysqli->query('SELECT tl_page....')
#2 system/modules/core/library/Contao/Database/Statement.php(293): Contao\Database\Mysqli\Statement->execute_query()
#3 system/modules/core/library/Contao/Database/Statement.php(264): Contao\Database\Statement->query()
#4 system/modules/core/library/Contao/Model.php(1089): Contao\Database\Statement->execute(Array)
#5 system/modules/core/library/Contao/Model.php(965): Contao\Model::find(Array)
#6 system/modules/core/models/PageModel.php(521): Contao\Model::findBy(Array, Array, Array)
#7 system/modules/core/controllers/FrontendIndex.php(93): Contao\PageModel::findPublishedByIdOrAlias('projekte/projek...')
#8 index.php(20): Contao\FrontendIndex->run()
#9 {main}

Fatal error: Uncaught exception Exception with message Query error: Out of resources when opening file './ar@002dwf_de_contao/tl_page.MYD' (Errcode: 24 - Too many open files) (SELECT tl_page.* FROM tl_page WHERE (tl_page.id=0 OR tl_page.alias='projekte/projektidee-mitteilen') AND (tl_page.start='' OR tl_page.start<='1534558020') AND (tl_page.stop='' OR tl_page.stop>'1534558080') AND tl_page.published='1') thrown in system/modules/core/library/Contao/Database/Statement.php on line 295
#0 system/modules/core/library/Contao/Database/Statement.php(264): Contao\Database\Statement->query()
#1 system/modules/core/library/Contao/Model.php(1089): Contao\Database\Statement->execute(Array)
#2 system/modules/core/library/Contao/Model.php(965): Contao\Model::find(Array)
#3 system/modules/core/models/PageModel.php(521): Contao\Model::findBy(Array, Array, Array)
#4 system/modules/core/controllers/FrontendIndex.php(93): Contao\PageModel::findPublishedByIdOrAlias('projekte/projek...')
#5 index.php(20): Contao\FrontendIndex->run()
#6 {main}