Butterknife: Could not get unknown property 'packageForR' for task

[lks6123]

AS version: 3.1
classpath 'com.jakewharton:butterknife-gradle-plugin:8.4.0'
Butterknife version：8.8.1

I update the androidstudio to 3.1, and found an error.
when you add "apply plugin: 'com.jakewharton.butterknife'" to any module ,you will get an error:
Could not get unknown property 'packageForR' for task ':app:processDebugResources' of type com.android.build.gradle.internal.res.LinkApplicationAndroidResourcesTask.

[zhupengxiang]

Can I answer in Chinese

[lks6123]

I found a solution to change the version of 'gradle_plugin' to 3.0.0， because it seems that the upgrade of 'gradle_plugin' has caused some of the fields to be lost。

[zhupengxiang]

use 9.0.0-SNAPSHOT

[lks6123]

@zhupengxiang 是的，这样也能解决，将gradle_plugin改为这个版本