Wizard error

After getting the following error:

Unable to create sites/default/themes.                        [error]
Failed to generate subtheme.                                                   [error]

I created the directory sites/default/themes, and set the permissions correctly (I think) to 775.

Then I re-ran the wizard.

At this stage:
Do you want to make your new theme the default theme? (y/n): y

I got the following error and was unable to proceed:

<h1>Additional uncaught exception thrown while handling exception.</h1><h2>Original</h2><p>PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: DELETE FROM {cache} 
WHERE  (cid LIKE :db_condition_placeholder_0 ESCAPE &amp;#039;\\&amp;#039;) ; Array
(
    [:db_condition_placeholder_0] =&amp;gt; theme\_registry%
)
 in cache_clear_all() (line 176 of /vagrant/public/includes/cache.inc).</p><h2>Additional</h2><p>PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: INSERT INTO {watchdog} (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9); Array
(
    [:db_insert_placeholder_0] =&amp;gt; 0
    [:db_insert_placeholder_1] =&amp;gt; php
    [:db_insert_placeholder_2] =&amp;gt; %type: !message in %function (line %line of %file).
    [:db_insert_placeholder_3] =&amp;gt; a:6:{s:5:&amp;quot;%type&amp;quot;;s:12:&amp;quot;PDOException&amp;quot;;s:8:&amp;quot;!message&amp;quot;;s:223:&amp;quot;SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: DELETE FROM {cache} 
WHERE  (cid LIKE :db_condition_placeholder_0 ESCAPE &amp;amp;#039;\\&amp;amp;#039;) ; Array
(
    [:db_condition_placeholder_0] =&amp;amp;gt; theme\_registry%
)
&amp;quot;;s:9:&amp;quot;%function&amp;quot;;s:17:&amp;quot;cache_clear_all()&amp;quot;;s:5:&amp;quot;%file&amp;quot;;s:34:&amp;quot;/vagrant/public/includes/cache.inc&amp;quot;;s:5:&amp;quot;%line&amp;quot;;i:176;s:14:&amp;quot;severity_level&amp;quot;;i:3;}
    [:db_insert_placeholder_4] =&amp;gt; 3
    [:db_insert_placeholder_5] =&amp;gt; 
    [:db_insert_placeholder_6] =&amp;gt; http://default/index.php
    [:db_insert_placeholder_7] =&amp;gt; 
    [:db_insert_placeholder_8] =&amp;gt; 127.0.0.1
    [:db_insert_placeholder_9] =&amp;gt; 1359514539
)
 in dblog_watchdog() (line 154 of /vagrant/public/modules/dblog/dblog.module).</p><hr />Drush command terminated abnormally due to an unrecoverable error.                                                               [error]