Fatal error: Uncaught Functional\Exceptions\InvalidArgumentException: Functional\flatten() expects parameter 1 to be array or instance of Traversable, integer given in /var/www/web291/html/www-holzspielerei-com/includes/vendor/lstrojny/functional-php/src/Functional/Exceptions/InvalidArgumentException.php:272
Stack trace:
#0 /var/www/web291/html/www-holzspielerei-com/includes/vendor/lstrojny/functional-php/src/Functional/Exceptions/InvalidArgumentException.php(70): Functional\Exceptions\InvalidArgumentException::assertCollectionAlike(0, 'Traversable', 'Functional\\flat...', 1)
#1 /var/www/web291/html/www-holzspielerei-com/includes/vendor/lstrojny/functional-php/src/Functional/Flatten.php(26): Functional\Exceptions\InvalidArgumentException::assertCollection(0, 'Functional\\flat...', 1)
#2 /var/www/web291/html/www-holzspielerei-com/includes/src/Link/LinkGroup.php(136): Functional\flatten(0)
#3 /var/www/web291/html/www-holzspielerei-com/includes/src/Link/LinkGroupList.php(200): JTL\Link\LinkGroup->map(Array)
#4 /var/www/web291/html/www-holzspielerei-com/includes/src/Link/LinkGroupList.php(92): JTL\Link\LinkGroupList->loadDefaultGroups()
#5 /var/www/web291/html/www-holzspielerei-com/includes/src/Services/JTL/LinkService.php(97): JTL\Link\LinkGroupList->loadAll()
#6 /var/www/web291/html/www-holzspielerei-com/includes/src/Services/JTL/LinkService.php(51): JTL\Services\JTL\LinkService->initLinkGroups()
#7 [internal function]: JTL\Services\JTL\LinkService->__construct(Object(JTL\DB\NiceDB), Object(JTL\Cache\JTLCache))
#8 /var/www/web291/html/www-holzspielerei-com/includes/vendor/illuminate/container/Container.php(877): ReflectionClass->newInstanceArgs(Array)
#9 /var/www/web291/html/www-holzspielerei-com/includes/vendor/illuminate/container/Container.php(714): Illuminate\Container\Container->build('JTL\\Services\\JT...')
#10 /var/www/web291/html/www-holzspielerei-com/includes/vendor/illuminate/container/Container.php(284): Illuminate\Container\Container->resolve('JTL\\Services\\JT...', Array, false)
#11 /var/www/web291/html/www-holzspielerei-com/includes/vendor/illuminate/container/Container.php(829): Illuminate\Container\Container->Illuminate\Container\{closure}(Object(JTL\Services\Container), Array)
#12 /var/www/web291/html/www-holzspielerei-com/includes/vendor/illuminate/container/Container.php(714): Illuminate\Container\Container->build(Object(Closure))
#13 /var/www/web291/html/www-holzspielerei-com/includes/vendor/illuminate/container/Container.php(661): Illuminate\Container\Container->resolve('JTL\\Services\\JT...')
#14 /var/www/web291/html/www-holzspielerei-com/includes/src/Services/Container.php(101): Illuminate\Container\Container->get('JTL\\Services\\JT...')
#15 /var/www/web291/html/www-holzspielerei-com/includes/src/Session/Frontend.php(274): JTL\Services\Container->getLinkService()
#16 /var/www/web291/html/www-holzspielerei-com/includes/src/Session/Frontend.php(91): JTL\Session\Frontend->updateGlobals()
#17 /var/www/web291/html/www-holzspielerei-com/includes/src/Session/Frontend.php(63): JTL\Session\Frontend->setStandardSessionVars()
#18 /var/www/web291/html/www-holzspielerei-com/includes/src/Session/Frontend.php(49): JTL\Session\Frontend->__construct(true, 'JTLSHOP')
#19 /var/www/web291/html/www-holzspielerei-com/includes/globalinclude.php(119): JTL\Session\Frontend::getInstance()
#20 /var/www/web291/html/www-holzspielerei-com/index.php(6): require('/var/www/web291...')
#21 {main}
thrown in /var/www/web291/html/www-holzspielerei-com/includes/vendor/lstrojny/functional-php/src/Functional/Exceptions/InvalidArgumentException.php on line 272