Magento 2.4.1 deploy sample data failed

[_Martin_]

Composer version 2.1.3

Magento CLI 2.4.2-p1

bin/magento sampledata:deploy

<warning>Warning from https://repo.packagist.org : Support for Composer 1 is deprecated and some packages will not be available. You should upgrade to Composer 2. See https://blog.packagist.com/deprecating-composer-1-support/ </warning>

Please help..

[amitsamsukha]

@_Martin_ ,

you need to reinstall your composer to the latest .

try 

composer self-update --2

if this doesn't work then try with the composer.phar.

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php composer-setup.php
php -r "unlink('composer-setup.php');"

it will create a file "composer.phar". 

if you have sudo/root user you can move this to bin folder to use globally 

mv composer.phar /usr/local/bin/composer

if you don't have sudo/root user then you can use this for composer as 

php composer.phar update

--

Kindly Accept as a Solution if this works for you and give Kudos  

[Jisse Reitsma]

Though it might not be relevant anymore (because of newer Magento versions and the date of this post), I see the wrongness of the earlier answer, so felt I wanted to reply anyway.

The reply of Amit suggests that you are using composer 1 on the CLI which is causing the error. That's incorrect, because you posted already that you are using composer 2. In short: Your composer version is fine, don't change it to fix the issue you are having - even though upgrading to the latest version might always be a good idea.

The warning on installing sample data is a warning, not an error. Warnings can be disregarded. So I assume the installation of sample data worked after all. Errors might be stopping you, warnings usually don't.

The reason this warning is given is that your composer command (which correctly uses v2) is triggering Magento-driven composer commands as well (which incorrectly still uses v1). The warning is something we can't easily fix. However, a next version of Magento will fix it. But note that the warning doesn't cause anything else but confusion.

[babakzahed4e67]

Try this it may be work : https://github.com/magento/magento2/issues/31558 / https://www.telltims.net/

[kevinrolan67a5]

Have you try switch php version from 7.3 to 7.4( Ex: 7.4.9)?

[aalapjohn2508f]

Yes I have try this php version from 7.3 to 7.4( Ex: 7.4.9). This is so awesome , Thank you.

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[arickgomesa353]

The commenter provides a helpful clarification to a previous answer regarding a warning message in Magento installation. They explain that the warning is not an error and can be disregarded, and that it is related to Magento-driven composer commands still using an outdated version of composer. They suggest that upgrading to the latest version of composer is a good idea but not necessary to fix the issue at hand.