You should provide at least your operating system, display driver, and what flightgear version you running in order to make other user able to help your problem.
From: Arthur Sulzbach
Sent: 5/5/2013 7:27
Subject: [Flightgear-users] Linguage portuguese and a question
HI, my name is Arthur and I do the download of the Flight gear. But I dont can opening the three page. Where I open the simulator, I need to select the airplain, next the AirPort and next the configuration(day). But in the lest page, open a Message! It is: Error, APP CRASH.