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Troubleshooting

Can not delete files

[RuntimeException]
Could not delete web/core/modules/layout_builder/tests/modules/layout_builder_test/src/Plugin/Layout/LayoutBuilderTestPlugin.php:

This is related to file ownership, see Error “could not delete” with Composer on Vagrant. Change ownership using chown owner:owner -R .

Out of memory

Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 23124288 bytes) in phar:///usr/local/bin/composer/src/Composer/Util/RemoteFilesystem.php on line 458

Increase php memory limit.

Package depenency issue

Your requirements could not be resolved to an installable set of packages.

Problem 1
    - Installation request for sebastian/diff (locked at 2.0.1) -> satisfiable by sebastian/diff[2.0.1].
    - phpunit/phpunit 7.0.0 requires sebastian/diff ^3.0 -> satisfiable by sebastian/diff[3.0.0].
    - phpunit/phpunit 7.0.1 requires sebastian/diff ^3.0 -> satisfiable by sebastian/diff[3.0.0].
    - phpunit/phpunit 7.0.2 requires sebastian/diff ^3.0 -> satisfiable by sebastian/diff[3.0.0].
    - Conclusion: don't install sebastian/diff 3.0.0
    - Installation request for phpunit/phpunit ^7 -> satisfiable by phpunit/phpunit[7.0.0, 7.0.1, 7.0.2].

$ composer remove phpunit/phpunit --dev
$ composer require phpunit/phpunit --dev