问题：
Yesterday my app was running perfect from Android Studio but today when I started working on my app and running it i am getting error message continuously昨天我的应用程序在Android Studio运行良好，但今天当我开始处理我的应用程序并运行它时，我不断收到错误消息
Installation failed with message Failed to establish session.安装失败并显示消息未能建立会话。
Screen :屏幕 ：
On click OK getting error message单击确定时收到错误消息
Session 'app':Error Installing APKs会话“应用程序”：安装 APK 时出错
And App is not exist(already Uninstalled) in device.并且设备中不存在应用程序（已卸载）。 Please suggest me what to do ?请建议我该怎么做？
解决方案：
参考一： https://en.stackoom.com/question/2t6zn参考二： https://stackoom.com/question/2t6zn