You are switching the terms chopchop and fragmentation. What you have there is a successful output of a fragmentation attack. As for your problem, you can try and see if your card is capable of chopchop and frag attacks, but you will need another wireless card. IIRC, the command was "aireplay-ng -9 -i <second device> <device you intend to test>". If the syntax is wrong, "man aireplay-ng" and "aireplay-ng --help" should clarify what's the right command.