Exception encountered, of type &quot;Error&quot;<br />
[aee874a4] /deepphe/wiki/api.php?action=query&amp;list=pagepropnames   Error from line 653 of /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/exception/MWExceptionHandler.php: Class 'FormatJson' not found<br />
Backtrace:<br />
#0 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/exception/MWExceptionHandler.php(241): MWExceptionHandler::logError(ErrorException, string)<br />
#1 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/AutoLoader.php(90): MWExceptionHandler::handleError(integer, string, string, integer, array)<br />
#2 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/AutoLoader.php(90): require()<br />
#3 [internal function]: AutoLoader::autoload(string)<br />
#4 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/api/ApiFormatJson.php(78): spl_autoload_call(string)<br />
#5 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/api/ApiMain.php(1420): ApiFormatJson-&gt;execute()<br />
#6 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/api/ApiMain.php(1278): ApiMain-&gt;printResult(boolean)<br />
#7 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/api/ApiMain.php(466): ApiMain-&gt;executeAction()<br />
#8 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/includes/api/ApiMain.php(438): ApiMain-&gt;executeActionWithErrorHandling()<br />
#9 /n/www/healthnlp.hms.harvard.edu/docroot/deepphe/wiki/api.php(88): ApiMain-&gt;execute()<br />
#10 {main}<br />