User blog comment:Dragonjet/Troubleshooting the Error Screen/@comment-25366430-20140830141844/@comment-25085594-20140830170307

I've had this problem before when I used my lappy to play. This is how to solved it (assuming you're using Chrome):

1) Clear your cache.

2) Use VPN and login to DMM via a Japanese IP address. Do not launch KC3 before this point.

3) Once you're in, launch the KC3 extension, it should automatically grab a new API link.

4) Close the game tab, disconnect from VPN.

5) Open another tab and re-launch KC3 again. It should work fine.