Android:Task '' not found in root project '*****'

使用Android Studio 开发安卓，导入一个工程遇到一个问题，具体如下:

Error:FAILURE: Build failed with an exception.
* What went wrong:
Task '' not found in root project 'android-visualizer-master1'.
* Try:
Run gradle tasks to get a list of available tasks. Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

截图为

这是因为Android Studio的早期版本错误配置了.iml文件，添加了一个

"<component name="FacetManager">"

XML这个不存在的属性.
所以，我们只要把这个属性的内容全部删掉就ok了

<component name="FacetManager"> ... </component>