Additional uncaught exception thrown while handling exception.

<h1>Additional uncaught exception thrown while handling exception.</h1><h2>Original</h2><p>PDOException: SQLSTATE[HY000]: General error: 14 unable to open database file: INSERT INTO {captcha_sessions} (uid, sid, ip_address, timestamp, form_id, solution, status, attempts) VALUES (?, ?, ?, ?, ?, ?, ?, ?); Array
(
    [0] =&amp;gt; 0
    [1] =&amp;gt; B3dkVjvMr8lNBbGEzHPEd7PaAP0zCPyvAzhLvqG_pOQ
    [2] =&amp;gt; 50.16.108.167
    [3] =&amp;gt; 1371700741
    [4] =&amp;gt; comment_node_page_form
    [5] =&amp;gt; a69ef7e0826345f4989820e9e78719c1
    [6] =&amp;gt; 0
    [7] =&amp;gt; 0
)
 in _captcha_generate_captcha_session() (line 121 of /htdocs/sites/all/modules/captcha/captcha.inc).</p><h2>Additional</h2><p>PDOException: SQLSTATE[HY000]: General error: 14 unable to open database file: INSERT INTO {watchdog} (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?); Array
(
    [0] =&amp;gt; 0
    [1] =&amp;gt; php
    [2] =&amp;gt; %type: !message in %function (line %line of %file).
    [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:453:&amp;quot;SQLSTATE[HY000]: General error: 14 unable to open database file: INSERT INTO {captcha_sessions} (uid, sid, ip_address, timestamp, form_id, solution, status, attempts) VALUES (?, ?, ?, ?, ?, ?, ?, ?); Array
(
    [0] =&amp;amp;gt; 0
    [1] =&amp;amp;gt; B3dkVjvMr8lNBbGEzHPEd7PaAP0zCPyvAzhLvqG_pOQ
    [2] =&amp;amp;gt; 50.16.108.167
    [3] =&amp;amp;gt; 1371700741
    [4] =&amp;amp;gt; comment_node_page_form
    [5] =&amp;amp;gt; a69ef7e0826345f4989820e9e78719c1
    [6] =&amp;amp;gt; 0
    [7] =&amp;amp;gt; 0
)
&amp;quot;;s:9:&amp;quot;%function&amp;quot;;s:35:&amp;quot;_captcha_generate_captcha_session()&amp;quot;;s:5:&amp;quot;%file&amp;quot;;s:45:&amp;quot;/htdocs/sites/all/modules/captcha/captcha.inc&amp;quot;;s:5:&amp;quot;%line&amp;quot;;i:121;s:14:&amp;quot;severity_level&amp;quot;;i:3;}
    [4] =&amp;gt; 3
    [5] =&amp;gt; 
    [6] =&amp;gt; http://panafricanisme.org/?q=content/les-decouvertes-du-professeur-gregoire-biyogo-philosophe-%C3%A9gyptologue-et-politologue-africain
    [7] =&amp;gt; 
    [8] =&amp;gt; 50.16.108.167
    [9] =&amp;gt; 1371700741
)
 in dblog_watchdog() (line 157 of /htdocs/modules/dblog/dblog.module).</p><hr />