Drush

I'm still somewhat new to all the command line stuff, so I can use some help sorting this one out.

When I attempt to do a "DRUSH UP" command, I get the following:

[warning] Declaration of Drush\Drupal\DrupalKernel::createFromRequest(Symfony\Component\HttpFoundation\Request $request, $class_loader, $environment, $allow_dumping = true) should be compatible with Drupal\Core\DrupalKernel::createFromRequest(Symfony\Component\HttpFoundation\Request $request, $class_loader, $environment, $allow_dumping = true, $app_root = NULL) DrupalKernel.php:46
[error] Command pm-update needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.
[error] The drush command 'up' could not be executed.
[error] Drush was not able to start (bootstrap) the Drupal database.
Hint: This may occur when Drush is trying to:
* bootstrap a site that has not been installed or does not have a configured database. In this case you can select another site with a working database setup by specifying the URI to use with the --uri parameter on the command line. See `drush topic docs-aliases` for details.
* connect the database through a socket. The socket file may be wrong or the php-cli may have no access to it in a jailed shell. See http://drupal.org/node/1428638 for details.

I seem to see this part about needing a higher bootstrap level, but I'm not clear what that means. How do I raise the "bootstrap level", so that Drush can do what it needs to do? I'm still learning Linux, though I'm relatively solid on DOS, so I'm not completely starting from square one, but from what I can make of this error message, the bootstrap level seems to be the issue. Is there something else here that I'm missing that I should be addressing also?

Thanks.