Uncaught Error: Class 'DOMDocument' not found in Magento 2.4 CE

[TheRealHunzik]

Preconditions (*)

1.Magento 2.4 CE
2.Apache 2.4.41 (Ubuntu)
3.PHP 7.4.8 (cli)
4.mysql Ver 8.0.21 for Linux on x86_64 (MySQL Community Server - GPL)
5.Ubuntu 20.04 LTS
6.Installed PHP extensions

[PHP Modules]
bcmath
bz2
calendar
Core
ctype
curl
date
dom
exif
FFI
fileinfo
filter
ftp
gd
gettext
hash
iconv
intl
json
libxml
mbstring
mysqli
mysqlnd
openssl
pcntl
pcre
PDO
pdo_mysql
Phar
posix
readline
Reflection
session
shmop
SimpleXML
sockets
sodium
SPL
standard
sysvmsg
sysvsem
sysvshm
tokenizer
xml
xmlreader
xmlwriter
xsl
Zend OPcache
zip
zlib

[Zend Modules]
Zend OPcache

7. i have tried to enable xml extension using phpenmod -v 7.4 xml

Steps to reproduce (*)

1.Download Latest version of Magento CE
2.Extract and copy to /var/www/html/magento24
3.Grant 777 permission usng command sudo chmod -R 777 magento24
4.Go to browser and submit url 'http://127.0.0.1/magento24/'

Expected result (*)

1. Magento Installation Setup should Start

Actual result (*)

1. Gave an error on
2. enable display error found Fatal error: Uncaught Error: Class 'DOMDocument' not found in /var/www/html/magento24/vendor/magento/framework/Config/Dom.php:449

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without a workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look, and feel, “quality” or “usability”.

[m2-assistant]

Hi @TheRealHunzik. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

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Please, add a comment to assign the issue: @magento I am working on this

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[ihor-sviziev]

@TheRealHunzik seems like you don't have installed dom php extension.
You can see that there is dependency declared in composer.json.

magento2/composer.json

Line 18 in ec098d2

"ext-dom": "*",

Also should should have such error in case if you'll run composer install.

In case if you don't have any errors during composer install - please restart apache and/or php-fpm services and try again.

[m2-assistant]

Hi @ihor-sviziev. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).

  Details

  If the issue has a valid description, the label Issue: Format is valid will be added to the issue automatically. Please, edit issue description if needed, until label Issue: Format is valid appears.

• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue. If the report is valid, add Issue: Clear Description label to the issue by yourself.

• 3. Add Component: XXXXX label(s) to the ticket, indicating the components it may be related to.

• 4. Verify that the issue is reproducible on 2.4-develop branch

  Details

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[sdzhepa]

Hello @TheRealHunzik

Did you have a chance to check #29387 (comment) ?
Based on the description it seems some kind of configuration/env issue.

Could you please provide an update?

Also, be aware that Web Install Wizard has been removed from Magento starting from 2.4.0 release.
Now it can be installed only using CLI

• https://devdocs.magento.com/guides/v2.4/install-gde/install/cli/install-cli.html
• https://devdocs.magento.com/guides/v2.4/install-gde/install/cli/install-cli-install.html#install-cli-example

[ihor-sviziev]

Hi @TheRealHunzik,
As we didn't get any response for a long time - we'll close this issue due to inactivity.
Feel free to write any comments or re-open this issue if this it still not resolved for you.