Error of installation (at last step)

when i installed blloc ratio pro, at the last step,an error happened, it is a sdk error,

how can i fix it? i like ratio launcher, i’d like to install it again.thanks.

my phone is Yotaphone3 with android7.1.1. Is this the problem?

You need android 8.1 or +

Because Yotaphone3 system is not upgrade, that way, i have to buy a new phone. that’s impossible now, what a pity.