Failed to open /qemu.conf, err: 2

Question

I got this error while using windows command prompt to connect a android virtual device to visual studio code. However opens the android virtual device but still says no connected devices when run the flutter doctor command. please help to use a android virtual device for visual studio code.

Answer 1

This error occur because there is a query for file in C:\qemu.conf path.

If you create a blank file the warning Failed to open /qemu.conf, err: 2 will desapear.

But in my tests, I needed to run as an administrator. (about this, look to the first comments above. Thanks for trick, Maikon Matheus)

This is the log in ProcessMonitor of Sysinternals:

Create the file with this command:

echo # > c:\qemu.conf

Answer 2

This issue is resolved by Cold Boot, the command emulator -avd <avd_name> -no-snapshot-load, execute this on command prompt or terminal on Linux.

Make sure that emulator is added to system PATH.

Answer 3

You have to fulfil android emulator requirements based on your system.

Android emulator requirements: https://developer.android.com/studio/run/emulator#requirements

My problem was missing this requirement:

reHAXM 6.2.1 or later (HAXM 7.2.0 or later recommended)

Solution was to go in Tools -> SDK Manager, and check Intel (HAXM installer) option.