Error when I tried to activate debug mode

[atroci]

I was with an error on the checkout page, it was showing some 500 error. I went to activate the debug mode to understand better and I got this after

 

Fatal error: Uncaught Symfony\Component\Filesystem\Exception\IOException: Failed to create "/var/www/html/tecnolog_2021/var/cache/dev/translations": mkdir(): Permission denied. in /var/www/html/tecnolog_2021/vendor/symfony/symfony/src/Symfony/Component/Filesystem/Filesystem.php:104 Stack trace: #0 /var/www/html/tecnolog_2021/vendor/symfony/symfony/src/Symfony/Component/Filesystem/Filesystem.php(677): Symfony\Component\Filesystem\Filesystem->mkdir('/var/www/html/t...') #1 /var/www/html/tecnolog_2021/vendor/symfony/symfony/src/Symfony/Component/Config/ResourceCheckerConfigCache.php(124): Symfony\Component\Filesystem\Filesystem->dumpFile('/var/www/html/t...', '<?php\n\nuse Symf...') #2 /var/www/html/tecnolog_2021/vendor/symfony/symfony/src/Symfony/Component/Translation/Translator.php(334): Symfony\Component\Config\ResourceCheckerConfigCache->write('<?php\n\nuse Symf...', Array) #3 /var/www/html/tecnolog_2021/vendor/symfony/symfony/src/Symfony/Component/Translation/Translator.php(299): Symfony\Component\Translation\Translator in /var/www/html/tecnolog_2021/vendor/symfony/symfony/src/Symfony/Component/Filesystem/Filesystem.php on line 104

[joseantgv]

You have a permissions' problem:

Failed to create "/var/www/html/tecnolog_2021/var/cache/dev/translations": mkdir(): Permission denied.

Contact your hosting.