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