Warning: Use of undefined constant TL_VERSION - assumed 'TL_VERSION' (this will throw an Error in a future version of PHP) in system/modules/metamodels/MetaModelFactory.php on line 76 
#0 system/modules/metamodels/MetaModelFactory.php(76): __error()
#1 system/modules/metamodels/MetaModelFactory.php(167): MetaModelFactory::initializeContaoObjectStack()
#2 system/modules/metamodels/MetaModelDatabase.php(470): MetaModelFactory::getAllTables()
#3 system/modules/core/library/Contao/DcaLoader.php(102): MetaModelDatabase->createDataContainer()
#4 system/modules/core/library/Contao/Controller.php(1319): Contao\DcaLoader->load()
#5 system/modules/core/library/Contao/DcaExtractor.php(382): Contao\Controller::loadDataContainer()
#6 system/modules/core/library/Contao/DcaExtractor.php(128): Contao\DcaExtractor->createExtract()
#7 system/modules/core/library/Contao/DcaExtractor.php(144): Contao\DcaExtractor->__construct()
#8 system/modules/core/library/Contao/Model/QueryBuilder.php(32): Contao\DcaExtractor::getInstance()
#9 system/modules/core/library/Contao/Model.php(1239): Contao\Model\QueryBuilder::find()
#10 system/modules/core/library/Contao/Model.php(1074): Contao\Model::buildFindQuery()
#11 system/modules/core/library/Contao/Model.php(930): Contao\Model::find()
#12 system/modules/core/models/PageModel.php(323): Contao\Model::findOneBy()
#13 system/modules/core/classes/Frontend.php(337): Contao\PageModel::findFirstPublishedRootByHostAndLanguage()
#14 system/modules/core/controllers/FrontendIndex.php(67): Contao\Frontend::getRootPageFromUrl()
#15 index.php(20): Contao\FrontendIndex->run()
#16 {main}

Warning: Use of undefined constant TL_VERSION - assumed 'TL_VERSION' (this will throw an Error in a future version of PHP) in system/modules/metamodels/MetaModelFactory.php on line 76 
#0 system/modules/metamodels/MetaModelFactory.php(76): __error()
#1 system/modules/metamodels/MetaModelFactory.php(167): MetaModelFactory::initializeContaoObjectStack()
#2 system/modules/metamodels/MetaModelDatabase.php(470): MetaModelFactory::getAllTables()
#3 system/modules/core/library/Contao/DcaLoader.php(102): MetaModelDatabase->createDataContainer()
#4 system/modules/core/library/Contao/Controller.php(1319): Contao\DcaLoader->load()
#5 system/modules/core/library/Contao/DcaExtractor.php(382): Contao\Controller::loadDataContainer()
#6 system/modules/core/library/Contao/DcaExtractor.php(128): Contao\DcaExtractor->createExtract()
#7 system/modules/core/library/Contao/DcaExtractor.php(144): Contao\DcaExtractor->__construct()
#8 system/modules/core/library/Contao/Model/QueryBuilder.php(32): Contao\DcaExtractor::getInstance()
#9 system/modules/core/library/Contao/Model.php(1239): Contao\Model\QueryBuilder::find()
#10 system/modules/core/library/Contao/Model.php(1074): Contao\Model::buildFindQuery()
#11 system/modules/core/library/Contao/Model.php(796): Contao\Model::find()
#12 system/modules/core/pages/PageRegular.php(231): Contao\Model::findByPk()
#13 system/modules/core/pages/PageRegular.php(39): Contao\PageRegular->getPageLayout()
#14 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate()
#15 index.php(20): Contao\FrontendIndex->run()
#16 {main}

Warning: Use of undefined constant TL_VERSION - assumed 'TL_VERSION' (this will throw an Error in a future version of PHP) in system/modules/metamodels/MetaModelFactory.php on line 76 
#0 system/modules/metamodels/MetaModelFactory.php(76): __error()
#1 system/modules/metamodels/MetaModelFactory.php(167): MetaModelFactory::initializeContaoObjectStack()
#2 system/modules/metamodels/MetaModelDatabase.php(470): MetaModelFactory::getAllTables()
#3 system/modules/core/library/Contao/DcaLoader.php(102): MetaModelDatabase->createDataContainer()
#4 system/modules/core/library/Contao/Controller.php(1319): Contao\DcaLoader->load()
#5 system/modules/core/library/Contao/DcaExtractor.php(382): Contao\Controller::loadDataContainer()
#6 system/modules/core/library/Contao/DcaExtractor.php(128): Contao\DcaExtractor->createExtract()
#7 system/modules/core/library/Contao/DcaExtractor.php(144): Contao\DcaExtractor->__construct()
#8 system/modules/core/library/Contao/Model/QueryBuilder.php(52): Contao\DcaExtractor::getInstance()
#9 system/modules/core/library/Contao/Model.php(1239): Contao\Model\QueryBuilder::find()
#10 system/modules/core/library/Contao/Model.php(1074): Contao\Model::buildFindQuery()
#11 system/modules/core/library/Contao/Model.php(796): Contao\Model::find()
#12 system/modules/core/pages/PageRegular.php(231): Contao\Model::findByPk()
#13 system/modules/core/pages/PageRegular.php(39): Contao\PageRegular->getPageLayout()
#14 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate()
#15 index.php(20): Contao\FrontendIndex->run()
#16 {main}

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/karsten-scholz.eu/httpdocs/system/helper/functions.php:65) in system/modules/core/pages/PageRegular.php on line 236 
#0 [internal function]: __error()
#1 system/modules/core/pages/PageRegular.php(236): header()
#2 system/modules/core/pages/PageRegular.php(39): Contao\PageRegular->getPageLayout()
#3 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate()
#4 index.php(20): Contao\FrontendIndex->run()
#5 {main}

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/karsten-scholz.eu/httpdocs/system/helper/functions.php:65) in system/helper/functions.php on line 143 
#0 [internal function]: __error()
#1 system/helper/functions.php(143): header()
#2 system/modules/core/pages/PageRegular.php(238): die_nicely()
#3 system/modules/core/pages/PageRegular.php(39): Contao\PageRegular->getPageLayout()
#4 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate()
#5 index.php(20): Contao\FrontendIndex->run()
#6 {main}
No layout specified

No layout specified

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The page you have requested has not yet been associated with a page layout.

How can I fix the issue?

Make sure that you have assigned a page layout to each website root page in the site structure.

Tell me more, please

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