Composer version 2.1.3
Magento CLI 2.4.2-p1
<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>
you need to reinstall your composer to the latest .
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
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.
Try this it may be work : https://github.com/magento/magento2/issues/31558 / https://www.telltims.net/
Have you try switch php version from 7.3 to 7.4( Ex: 7.4.9)?
Yes I have try this php version from 7.3 to 7.4( Ex: 7.4.9). This is so awesome , Thank you.
However it probably won't be significant any longer (in light of fresher Magento adaptations and the date of this post), I see the unsoundness of the previous response, so felt I needed to answer at any rate.
The answer of Amit proposes that you are utilizing arranger 1 on the CLI which is causing the mistake. That is inaccurate, in light of the fact that you posted currently that you are utilizing writer 2. In short: Your writer rendition is fine, don't transform it to fix the issue you are having - despite the fact that moving up to the furthest down the line form could constantly be smart.
The admonition on introducing test information is an admonition, not a mistake. Alerts can be ignored. So I accept the establishment of test information worked all things considered. Mistakes may be halting you, admonitions typically don't.
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