Upgrading Drupal

Luckily i was smart enough to make a backaup of the DB before i ran the updates but for some reason deleting and re-installing the backup copy does not fix the problem.

The error i get is

The website encountered an unexpected error. Please try again later.
Error: Class 'Drupal\commerce\TwigExtension\CommerceTwigExtension' not found in Drupal\Component\DependencyInjection\Container->createService() (line 264 of core/lib/Drupal/Component/DependencyInjection/Container.php).

Hi,

Searched everywhere but still didn't found the answer: How to run composer for a required website under my multisite configuration?

Thanks.

I am relatively new to Composer. I just upgraded from 8.3.7 to 8.4.0 after reading every entry on upgrading in this forum. My site now is totally down. I have had to restore from a backup. Here are the steps that I followed. Can someone point out what the problem might be?

The steps that I followed:

1) Renamed composer.lock, core and vendor to _composer.lock, _core and _vender, respectively.

2) Added "drupal/core": "~8.4" to my composer.json. (see below for my composer.json file).

3) $composer update --with-dependencies

I am using composer when updating. When updating core composer.json and the lock file are updated also.

Shall I copy back the old composer.json and composer.lock or only composer.json?

I have been working through a Drupal 6 to Drupal 8.4 site upgrade, and I am stymied at the current problem I'm experiencing: when I perform the upgrade from mysite.com/upgrade, the process completes, but the user data conversion and all the following data conversions that depend on that fail.

Hello,

I've just upgraded Drupal on my production site from 8.3.7 to 8.4.0. Before that i had tested it on local environment. All was fine so i've decided to deal with it on my site. Everything went fine i guess, because my site is working, but during installation process i've got one extra PHP fatal error: