An internal error occurred during: "Launching New_configuration"该怎么处理

An internal error occurred during: Launching New_configuration.自己新建工程,写的程序,用模拟器运行

An internal error occurred during: "Launching New_configuration".
自己新建工程,写的程序,用模拟器运行OK。
  一旦导入一些简单的demo就报错,An internal error occurred during: "Launching New_configuration".
Path for project must have only one segment.
  problems里面显示: the type R is already defined
  纠结。

[解决办法]
对导入的工程最好先clean一下,再build