second blog problem.

I installed my bp on 2nd blog. and installed this plugin.
http://codex.buddypress.org/user/install-buddypress-on-a-secondary-blog/

But I active on network (cuz I couldn’t find this on my 2nd plugin list)

then my 1st blog gets error and not show on backend admin page.

any solution?

http://ww.wp.xz.cn/extend/plugins/bp-checkins/