I’m using Atahualpa v.3.7.21. I almost tried to disable all plugins related to Buddypress, but finally it was solved by disable the “buddypress template pack v.1.0.2”. Therefore, I upgraded it to the newest version(v. 1.2.1) then the theme crashed as before. I think it is the old problems that Atahualpa is not compatible with buddypress(I thought it had been solved recently).
I’ve checked that there would be a new version of “buddypress template pack” released soon. So, it is better to wait.