Exception encountered, of type &quot;Error&quot;<br />
[68fca3f2] /wiki/api.php?action=help&amp;modules=%241   Error from line 653 of /var/www/www.docodoco.jp/wiki/includes/exception/MWExceptionHandler.php: Class 'FormatJson' not found<br />
Backtrace:<br />
#0 /var/www/www.docodoco.jp/wiki/includes/exception/MWExceptionHandler.php(241): MWExceptionHandler::logError(ErrorException, string)<br />
#1 /var/www/www.docodoco.jp/wiki/includes/AutoLoader.php(90): MWExceptionHandler::handleError(integer, string, string, integer, array)<br />
#2 /var/www/www.docodoco.jp/wiki/includes/AutoLoader.php(90): require()<br />
#3 [internal function]: AutoLoader::autoload(string)<br />
#4 /var/www/www.docodoco.jp/wiki/includes/api/ApiFormatJson.php(78): spl_autoload_call(string)<br />
#5 /var/www/www.docodoco.jp/wiki/includes/api/ApiFormatRaw.php(88): ApiFormatJson-&gt;execute()<br />
#6 /var/www/www.docodoco.jp/wiki/includes/api/ApiMain.php(1420): ApiFormatRaw-&gt;execute()<br />
#7 /var/www/www.docodoco.jp/wiki/includes/api/ApiMain.php(538): ApiMain-&gt;printResult(boolean)<br />
#8 /var/www/www.docodoco.jp/wiki/includes/api/ApiMain.php(469): ApiMain-&gt;handleException(UsageException)<br />
#9 /var/www/www.docodoco.jp/wiki/includes/api/ApiMain.php(438): ApiMain-&gt;executeActionWithErrorHandling()<br />
#10 /var/www/www.docodoco.jp/wiki/api.php(88): ApiMain-&gt;execute()<br />
#11 {main}<br />