I CAN’T LOG IN

Hello. I have a problem with S115-Arachnis-EST and my player name is Bidkir. I play with GTArcade desktop app. I try to log in but I can’t. I either get a black screen or a white suggesting to right click to run Adobe Flash player! I have been trying for two days.

I also tried to clear my League of Angels cache. Nothing happened. Thanks in advance for any help you can give