Flash - MXMLC Compiles Without Error But Shows Blank Screen

I have followed tut here [URL] and compiled with flex3.6 and flex4.6 but running swf gives a blank screen. Same program compiled with FDT 5 [URL] and runs fine. So what's missing in the command line?

Update: command line I used is just
mxmlc "c:flextutorialHelloWorld.as"
The same as in the tutorial above.

It doesn't run either with FlashDevelop [URL]. But why it does with FDT 5 [URL]? My source code:
package {
import flash.display.Sprite;
import flash.text.TextField;
public class HelloWorld extends Sprite {
public function HelloWorld() {
[Code] .....