ErrorException: Undefined array key "pdf"
 at flight.Engine.handleError(index.php:741)
 at pdfexport(index.php:741)
 at {closure}(index.php:511)
 at flight.core.Dispatcher.callFunction(Dispatcher.php:173)
 at flight.core.Dispatcher.execute(Dispatcher.php:145)
 at flight.Engine._start(Engine.php:342)
 at flight.core.Dispatcher.invokeMethod(Dispatcher.php:198)
 at flight.core.Dispatcher.execute(Dispatcher.php:144)
 at flight.core.Dispatcher.run(Dispatcher.php:49)
 at flight.Engine.__call(Engine.php:92)
 at flight.core.Dispatcher.invokeMethod(Dispatcher.php:198)
 at Flight.__callStatic(Flight.php:77)
 at (main)(index.php:2050)