android-apt:1.4' case databing error

[fengqingyun2008]

In project's build.gradle, android-apt:1.4' case databing error.
when id updata android-apt:1.8' ,it works OK.

[fengqingyun2008]

I find android-apt:1.8 and butterknife's apt conflict,
then I change
annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'
to
apt 'com.jakewharton:butterknife-compiler:8.4.0'
,it works OK.