Fatal error: Invalid SQL: SELECT * FROM wbb1_1_board_moderator WHERE groupID IN (1,2) ORDER BY userID DESC

You get more information about the problem in our knowledge base: http://www.woltlab.com/help/?code=23

Information:

error message: Invalid SQL: SELECT * FROM wbb1_1_board_moderator WHERE groupID IN (1,2) ORDER BY userID DESC
error code: 23
sql type: MySQLDatabase
sql error: Out of resources when opening file './gayfetish/wbb1_1_board_moderator.MYD' (Errcode: 24 - Too many open files)
sql error number: 23
sql version:
file: /var/www/gay-fetish.de/public_html/wcf/lib/system/database/MySQLDatabase.class.php (116)
php version: 5.6.24-1+b1
wcf version: 1.0.4 pl 1
date: Fri, 14 Dec 2018 12:36:46 +0000
request: /board/index.php?page=Board&boardID=5&s=2c156b1928c0f56266285e318d14714da0c8ab91
referer:

Stacktrace:

#0 /var/www/gay-fetish.de/public_html/board/lib/data/user/AbstractWBBUserSession.class.php(68): MySQLDatabase->sendQuery('SELECT\t\t*\n\t\t\tFR...')
#1 /var/www/gay-fetish.de/public_html/wcf/lib/system/session/UserSession.class.php(61): AbstractWBBUserSession->getGroupData()
#2 /var/www/gay-fetish.de/public_html/wcf/lib/data/DatabaseObject.class.php(20): UserSession->handleData(NULL)
#3 /var/www/gay-fetish.de/public_html/wcf/lib/data/user/User.class.php(65): DatabaseObject->__construct(NULL)
#4 /var/www/gay-fetish.de/public_html/wcf/lib/system/session/UserSession.class.php(31): User->__construct(NULL, NULL, NULL, NULL)
#5 /var/www/gay-fetish.de/public_html/wcf/lib/system/session/CookieSessionFactory.class.php(39): UserSession->__construct()
#6 /var/www/gay-fetish.de/public_html/wcf/lib/system/session/SessionFactory.class.php(71): CookieSessionFactory->create()
#7 /var/www/gay-fetish.de/public_html/board/lib/system/WBBCore.class.php(180): SessionFactory->get()
#8 /var/www/gay-fetish.de/public_html/wcf/lib/system/WCF.class.php(49): WBBCore->initSession()
#9 /var/www/gay-fetish.de/public_html/board/global.php(18): WCF->__construct()
#10 /var/www/gay-fetish.de/public_html/board/index.php(7): require_once('/var/www/gay-fe...')
#11 {main}