adb server version doesn't match this client

Question

Whenever I try to run adb devices:

            $ adb devices
            * daemon not running. starting it now *
            * daemon started su         


        

Answer 1

First close All the things which use ADB. (Android Studio, Eclipse, Emulator(Bluestack as well)) and then do

adb kill-server
adb start-server

In my case I just got update of Studio.

Answer 2

As mentioned above, the problem comes due to a conflicting version of adb.exe shipped with HTC Sync. Removing it from PATH won't help, as htcUPCTLoader.exe that constantly runs in the background will still re-launch the wrong ADB version.

One solution would be to completely remove adb.exe from the HTC Sync folder, however this would break HTC Sync.

I've just coded a simple tool that replaces the old adb.exe with a stub that invokes the latest adb.exe from the SDK directory eliminating the conflicts (e.g. version 1.0.25 coming with HTC Sync and 1.0.29 with Android SDK).

The tool can be downloaded from http://visualgdb.com/adbfix

Answer 3

Helped for me: stop HTC Sync (in system tray) and rename HTC's adb.exe (C:\Program Files (x86)\HTC\HTC Sync 3.0\adb.exe).

Answer 4

OS: Ubuntu

There are more than 1 adb are running. Check the current adb:

    which adb
    Expected Output : ANDROID_SDK/platform-tools/adb

Normally the result will be:

    /usr/bin/adb

Delete this older version by:

    cd /urs/bin
    sudo rm adb

Answer 5

If the device you're trying to interact with is a physical phone connected via USB, you can unplug it and plug it back and and it should work. Sometimes it just gets out of sync I think.

Answer 6

Okay, there is another instance of adb.exe distributed with "Lenovo Photo Companion". A friend of mine has a Lenovo Yoga notebook and had this software installed which includeded another adb.exe

Deinstalling it solved the problem.