android studio 提示Failed to delete some children. This might happen because a process has

android studio build/clean/rebuild项目时提示

Failed to delete some children. This might happen because a process has files open or has its working directory set in the target directory.

是使用了 as 自带的 terminal 窗口，并且打开了某个目录，只需要在android studio的terminal 命令行里面 输入exit