Unable to load class \Drush\VersionControl\Backup

Question

I keep getting this error : Unable to load class \Drush\VersionControl\Backup every time i attempt to update my Drupal install from 8.4.0 to 8.4.2.

I am running the composer provided drush Drush Version : 8.1.15

Now here is what i have tried:

• drush up drupal --debug
  Unable to load class \Drush\VersionControl\Backup

• drush up drupal --debug --version-control=svn
  No valid version control or backup engine found

• drush up drupal --debug --version-control=git
  No valid version control or backup engine found

• drush up drupal --debug --no-backup
  No valid version control or backup engine found

if anyone could answer any of these question for me, i would really appreciate it: How do i turn off version control? How do i set the valid version control that this thing is complaining about? How do i set the backup engine?

Note: some solutions out there mentioned that we have to remove the composer provided version and install drush to a different location. To be honest I do not want to use that solution.

Thanks.

Answer 1

I am running the composer provided drush Drush Version : 8.1.15

Drupal 8.4 requires Drush 9, so upgrade your Drush for starters.

composer global require drush/drush:master 

http://docs.drush.org/en/master/install/

Answer 2

Install drush globally.

composer global require drush/drush:8.x

Works on Drupal 7 and 8.

You might have trouble locating the drush file to run as it will be at another location now. You can try to find it by running composer global show drush/drush Ideally change your PATH: settings to this.

Answer 3

Remove Drush from the project composer and use globally installed Drush.

While working on a Drupal 7 install, with Drush 8 and using Drush launcher.