As 3.1 has been released you should post this i 3.1 Support at : https://www.phpbb.com/community/viewforum.php?f=466
With that said, "No such file or directory" is exactly what it says, "/vendor/symfony/routing/Symfony/Component/Routing/RouteCollection.php" is missing.
error
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Please do not post any "phpBB" specific topics here unless they do not fit into the category above.
Do not post bug reports, feature or support requests! No really... Do not post bug reports, feature or support requests! Doing so will make Bertie a very sad bear indeed. :(
Re: error
William Jacoby - Community Team
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Knowledge Base | phpBB Board Rules | Search Customisation Database
Please don't contact me via PM or email for phpBB support .