android studio 代码混淆出现异常

Question

:app:proguardRelease
Warning:butterknife.internal.ButterKnifeProcessor: can't find referenced field 'javax.annotation.processing.ProcessingEnvironment processingEnv' in program class butterknife.internal.ButterKnifeProcessor
Warning:there were 1 unresolved references to program class members.
Your input classes appear to be inconsistent.
You may need to recompile the code.
(http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedprogramclassmember)
:app:proguardRelease FAILED
Error:Execution failed for task ':app:proguardRelease'.

java.io.IOException: Please correct the above warnings first.

Answer 1

there were 1 unresolved references to program class members.有1个未解决类成员，再看看静态变量和方法参数有没有错