9:32 Emulator: emulator: ERROR: Unknown AVD name [Nexus_5X_API_28], use -list-avds to see valid list

9:32 Emulator: emulator: ERROR: Unknown AVD name [Nexus_5X_API_28], use -list-avds to see valid list.

9:32 Emulator: Process finished with exit code 1

解决方法：将C盘中的avd文件夹
默认为C:\Users\Administrator.android\avd
复制到环境变量ANDROID_SDK_HOME所指向的文件夹内

AVD成功启动。