Error:A problem occurred configuring root project 'testProject'.

> Could not open cp_proj class cache for build file 'E:\testProject\build.gradle' (C:\Users\cx\.gradle\caches\2.8\scripts\build_23c6mfkakzmi6u18917l1hu2i\cp_proj).
   > Timeout waiting to lock cp_proj class cache for build file 'E:\testProject\build.gradle' (C:\Users\cx\.gradle\caches\2.8\scripts\build_23c6mfkakzmi6u18917l1hu2i\cp_proj). It is currently in use by another Gradle instance.
     Owner PID: unknown
     Our PID: 11668
     Owner Operation: unknown
     Our operation: Initialize cache

Lock file: C:\Users\cx\.gradle\caches\2.8\scripts\build_23c6mfkakzmi6u18917l1hu2i\cp_proj\cache.properties.lock

这个问题解决起来很简单，删除最后的路径下的文件就可以了。