PHP Fatal error after PHP upgrade

Hi, I am upgrading PHP on this website, since we are using PHP 7.4, however, once I go to PHP 8.0+ I get a Fatal error and I see this on the error log: PHP Fatal error: Uncaught Error: Undefined constant "ENV" in /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Extension/CoreExtension.php:1661 Stack trace: #0 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Extension/CoreExtension.php(1661): constant('ENV') #1 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Environment.php(497) : eval()'d code(30): twig_constant('ENV') #2 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(453): __TwigTemplate_53e9d8e1532f224322e40f11d9628ced0ef859351326ec40020691e39bf7212b->doDisplay(Array, Array) #3 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array) #4 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Environment.php(497) : eval()'d code(84): Twig\Template->display(Array) #5 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(453): __TwigTemplate_463bbf3a9ad038b5ee00f4f934eb82c973c950e04f16fdf7b490be87ad3d210b->doDisplay(Array, Array) #6 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array) #7 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Environment.php(497) : eval()'d code(35): Twig\Template->display(Array, Array) #8 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(453): __TwigTemplate_6117eef2967e4024a8ddd13d22f98637553697006029f77f64e8511beda77b5b->doDisplay(Array, Array) #9 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array) #10 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Environment.php(497) : eval()'d code(31): Twig\Template->display(Array) #11 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(453): __TwigTemplate_1412182097d0a23bc5f170f22c3537c40d9efcdedeb01625fc6e0e9929b2a5d5->doDisplay(Array, Array) #12 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array) #13 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(432): Twig\Template->display(Array) #14 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/TemplateWrapper.php(47): Twig\Template->render(Array, Array) #15 /dom42117/wp-content/plugins/timber-library/lib/Loader.php(79): Twig\TemplateWrapper->render(Array) #16 /dom42117/wp-content/plugins/timber-library/lib/Timber.php(334): Timber\Loader->render('page.twig', Array, false, 'default') #17 /dom42117/wp-content/plugins/timber-library/lib/Timber.php(383): Timber\Timber::compile(Array, Array, false, 'default', true) #18 /dom42117/wp-content/plugins/timber-library/lib/Timber.php(410): Timber\Timber::fetch(Array, Array, false, 'default') #19 /dom42117/wp-content/themes/accedian/page.php(70): Timber\Timber::render(Array, Array) #20 /wordpress-versions/6.1.1/wp-includes/template-loader.php(106): include('/dom42117/wp-co...') #21 /wordpress-versions/6.1.1/wp-blog-header.php(19): require_once('/wordpress-vers...') #22 /wordpress-versions/6.1.1/index.php(17): require('/wordpress-vers...') #23 {main} thrown in /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Extension/CoreExtension.php on line 1661 I went back to PHP 7.4 and it is ok now, do you guys have any idea? Timber Plugin is on its latest version. This topic was modified 3 years, 6 months ago by castiblanco . The page I need help with: [ log in to see the link] I am also having this issue. Our hosting platform will be automatically upgraded to PHP 8.0 at the end of this month, so I’m really hoping there’s a fix by then. Would you mind opening an issue for this in the Timber repository on GitHub ? We only rarely track issues here.