I'm new to Drupal and Drush and so am hoping someone can shed some light on this.
I tried to turn on Theme Debug with Drush:
drush vset theme_debug 1
But I keep getting an error I don't entirely understand:
Drush command terminated abnormally due to an unrecoverable error. Error: Declaration of Drush\Command\DrushInputAdapter::hasParameterOption() must be compatible with Symfony\Component\Console\Input\InputInterface::hasParameterOption($values, $onlyParams = false) in phar:///usr/local/bin/drush/lib/Drush/Command/DrushInputAdapter.php, line 27
drush status too and got the same issue, so I think drush is probably broken across the board.
I tried deleting and reinstalling drush and reprovisioning my virtual box to no affect.
Would anyone know what could've gone wrong here?
(I am running Drush 8.1.7. on Drupal 7.5)