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; JqiADoDhJXHLytRTTPXYNsii8LQf2xxc3LDiQJCj6eE
    [2] =&amp;gt; 54.198.15.20
    [3] =&amp;gt; 1539807836
    [4] =&amp;gt; webform_client_form_67
    [5] =&amp;gt; e4126e6daef56c2e72bfd5b26d00bf04
    [6] =&amp;gt; 0
    [7] =&amp;gt; 0
)
 in _captcha_generate_captcha_session() (line 175 of /home/istar786/public_html/sites/rds/kipm/mba/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:452:&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; JqiADoDhJXHLytRTTPXYNsii8LQf2xxc3LDiQJCj6eE
    [2] =&amp;amp;gt; 54.198.15.20
    [3] =&amp;amp;gt; 1539807836
    [4] =&amp;amp;gt; webform_client_form_67
    [5] =&amp;amp;gt; e4126e6daef56c2e72bfd5b26d00bf04
    [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:83:&amp;quot;/home/istar786/public_html/sites/rds/kipm/mba/sites/all/modules/captcha/captcha.inc&amp;quot;;s:5:&amp;quot;%line&amp;quot;;i:175;s:14:&amp;quot;severity_level&amp;quot;;i:3;}
    [4] =&amp;gt; 3
    [5] =&amp;gt; 
    [6] =&amp;gt; http://mba.kipm.edu.in/?q=node/67
    [7] =&amp;gt; 
    [8] =&amp;gt; 54.198.15.20
    [9] =&amp;gt; 1539807836
)
 in dblog_watchdog() (line 160 of /home/istar786/public_html/sites/rds/kipm/mba/modules/dblog/dblog.module).</p><hr />