Installation cakephp 3.4 error : "post-autoload-dump"

what is that error ?

In composer.json you have to remove the "post-autload-dump" line because it does nothing with composer >2.0 (which you are using)

It is still necesary when you use composer 1.x, make sure you upgrade composer everywhere before deleting it

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The error message tells you exactly what the problem is and how to fix it.

It’s not required for any composer version with plugin-installer 1.3.

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