Warning: A non-numeric value encountered in system/modules/core/library/Contao/Picture.php on line 241 
#0 system/modules/core/library/Contao/Picture.php(241): __error()
#1 system/modules/core/library/Contao/Picture.php(198): Contao\Picture->getTemplateDataSource()
#2 system/modules/core/library/Contao/Controller.php(1535): Contao\Picture->getTemplateData()
#3 system/modules/core/elements/ContentHyperlink.php(74): Contao\Controller::addImageToTemplate()
#4 system/modules/core/elements/ContentElement.php(265): Contao\ContentHyperlink->compile()
#5 system/modules/core/library/Contao/Controller.php(484): Contao\ContentElement->generate()
#6 system/modules/core/modules/ModuleArticle.php(213): Contao\Controller::getContentElement()
#7 system/modules/core/modules/Module.php(287): Contao\ModuleArticle->compile()
#8 system/modules/core/modules/ModuleArticle.php(67): Contao\Module->generate()
#9 system/modules/core/library/Contao/Controller.php(417): Contao\ModuleArticle->generate()
#10 system/modules/core/library/Contao/InsertTags.php(430): Contao\Controller::getArticle()
#11 system/modules/core/library/Contao/Controller.php(692): Contao\InsertTags->replace()
#12 system/modules/core/classes/FrontendTemplate.php(100): Contao\Controller::replaceInsertTags()
#13 system/modules/core/pages/PageRegular.php(190): Contao\FrontendTemplate->output()
#14 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate()
#15 index.php(20): Contao\FrontendIndex->run()
#16 {main}

Warning: A non-numeric value encountered in system/modules/core/library/Contao/Picture.php on line 242 
#0 system/modules/core/library/Contao/Picture.php(242): __error()
#1 system/modules/core/library/Contao/Picture.php(198): Contao\Picture->getTemplateDataSource()
#2 system/modules/core/library/Contao/Controller.php(1535): Contao\Picture->getTemplateData()
#3 system/modules/core/elements/ContentHyperlink.php(74): Contao\Controller::addImageToTemplate()
#4 system/modules/core/elements/ContentElement.php(265): Contao\ContentHyperlink->compile()
#5 system/modules/core/library/Contao/Controller.php(484): Contao\ContentElement->generate()
#6 system/modules/core/modules/ModuleArticle.php(213): Contao\Controller::getContentElement()
#7 system/modules/core/modules/Module.php(287): Contao\ModuleArticle->compile()
#8 system/modules/core/modules/ModuleArticle.php(67): Contao\Module->generate()
#9 system/modules/core/library/Contao/Controller.php(417): Contao\ModuleArticle->generate()
#10 system/modules/core/library/Contao/InsertTags.php(430): Contao\Controller::getArticle()
#11 system/modules/core/library/Contao/Controller.php(692): Contao\InsertTags->replace()
#12 system/modules/core/classes/FrontendTemplate.php(100): Contao\Controller::replaceInsertTags()
#13 system/modules/core/pages/PageRegular.php(190): Contao\FrontendTemplate->output()
#14 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate()
#15 index.php(20): Contao\FrontendIndex->run()
#16 {main}
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Every year, the Contao Core development team meets twice for a short code sprint of three days.