Problem lauching app on android emulator

i’m new with ionic and i just launch a testapp.

sdk is ok / avd is ok (nexus api23)

When i use ionic emulate android, the emulator is launch but no app appear.
In the console the last line was

  • Emulator warning : increasing RAM size to 1gb

  • Emulator : updatechecker : skipped version check

  • i have just the android logo on emulator

then nothing else.

anyone seems what is not ok ?

Edit : in browser its ok.

thanks by advance