Why the game said I lost this game

Hi, can someone explain why I lost here please ?  I'm playing black.

If you played the game on site, inside info you will see the manner in which game ended - for instance win by checkmate, drawn by stalemate etc...

I don't see this position in any of your 2 games on site, so I can't be sure, but it is probably either due to time or due to abandonment of the game (for instance if there are connection problems, if you just leave the game altogether or something like that).

What game is this? There are only 2 games in your archive and neither of them contain this position...black is not doing very well here but the game has not finished. Did you run out of time? 

Yeah I forgot to login when I played that game, It was not a timeout. As soon as knight took my rook, the end of game popup appear and said white won.