Composer Dump-autoload Or Update Results In Fatal Error On Laravel 5.5


Answer :

I just found a solution to this problem. Here it is for those who have the same problem.


I have had to delete the directory kylekatarnls located inside my vendor directory then run composer update --prefer-source and after that composer dump-autoload.


Now all is working just fine.



It seems like you're using Composer v2. If so, read on...


Composer v2 adds some new functions to their Plugin interface (namely deactivate() and uninstall())


However kylekatarnls/update-helper < v1.2.1 is implementing said interface but does not implement the new functions.


So to fix, you'll need to update kylekatarnls/update-helper to the latest (v1.2.1 at time of writing), which contains a fix (implements the missing methods):


composer update kylekatarnls/update-helper


I remove the vendor directory and the composer.lock file. After execute composer install and all works well.



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