守护进程没有运行； adb: CreateFileW 'nul' failed: 系统找不到指定的文件。 Android Studio 错误

Question

daemon not running; adb: CreateFileW 'nul' failed: The system cannot find the file specified. I'm getting this error on running an app. The gradle does complete build and the emulator also runs with android but the app doesn't open and I can't find it either in the apps of the device. And I am using one of those default templates when you create a new project without any modifications. I have tried downloading and replacing three files ( adb.exe, AdbWinApi.dll, AdbWinUsbApi.dll) in the platform-tools in appdata. It says run manually if necessary. So i went to that directory and ran the command: adb start-server, in the command prompt but it gives the same error:

C:\Users\samir\AppData\Local\Android\Sdk\platform-tools>adb start-server

* daemon not running; starting now at tcp:5037

adb: CreateFileW 'nul' failed: The system cannot find the file specified. (2)

* failed to start daemon

error: cannot connect to daemon

How do I fix this?

Answer 1

6 months later but just encountered this problem.

Found the solution after digging for 5 hours based on this: https://issuetracker.google.com/issues/169425447

Basically need to modify the register key "Start" found on:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Null\Start 

to 1

I don't know why I had that disabled but changing it and restarting fixed everything. Hope to help someone.