Exception encountered, of type &quot;Error&quot;<br />
[aQm8E_5Vnu0R1K6g2_QY9QAAABE] /guerre-14-18/index.php?oldid=13053&amp;title=Pl%C3%A9d%C3%A9liac   Error from line 663 of /home/clients/f3156ba81aa2e9f0bb41393ccbfb3cdc/web/guerre-14-18/includes/exception/MWExceptionHandler.php: Class 'FormatJson' not found<br />
Backtrace:<br />
#0 /home/clients/f3156ba81aa2e9f0bb41393ccbfb3cdc/web/guerre-14-18/includes/exception/MWExceptionHandler.php(242): MWExceptionHandler::logError(ErrorException, string)<br />
#1 /home/clients/f3156ba81aa2e9f0bb41393ccbfb3cdc/web/guerre-14-18/includes/AutoLoader.php(81): MWExceptionHandler::handleError(integer, string, string, integer, array)<br />
#2 /home/clients/f3156ba81aa2e9f0bb41393ccbfb3cdc/web/guerre-14-18/includes/AutoLoader.php(81): require()<br />
#3 [internal function]: AutoLoader::autoload(string)<br />
#4 /home/clients/f3156ba81aa2e9f0bb41393ccbfb3cdc/web/guerre-14-18/includes/exception/MWExceptionHandler.php(632): spl_autoload_call(string)<br />
#5 /home/clients/f3156ba81aa2e9f0bb41393ccbfb3cdc/web/guerre-14-18/includes/exception/MWExceptionHandler.php(179): MWExceptionHandler::logException(DBQueryError)<br />
#6 /home/clients/f3156ba81aa2e9f0bb41393ccbfb3cdc/web/guerre-14-18/includes/MediaWiki.php(518): MWExceptionHandler::handleException(DBQueryError)<br />
#7 /home/clients/f3156ba81aa2e9f0bb41393ccbfb3cdc/web/guerre-14-18/index.php(43): MediaWiki-&gt;run()<br />
#8 {main}<br />