Everything about class

Worked fine for the 1st week I desired it, but now it seems there is a bug or some thing. Each and every time I try to open up the app it asks me to check in, but as soon as I simply click my account it acts like it should open then goes right back again to the "begin" web page, inquiring me to sign in yet again.

: a bunch, set, or sort marked 퍼펙트 솔루션 by frequent attributes or a typical attribute Specifically : A significant class in biological taxonomy ranking above the order and down below the phylum or division the class Mammalia