No connected devices

Hello. I have an idea of easy android aplication, but in Android -> Select device is nothing.

I use Android SDK download automaticlly with Processing. I also have USB Debugging turn on on my phone (Honor 3C).

When I start Processing in Android mode some errors apear in console:

Problem inside Devices.list()
java.io.IOException: Cannot run program "adb": CreateProcess error=2, Systém nem?že nalézt uvedený soubor
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
    at java.lang.Runtime.exec(Runtime.java:620)
    at java.lang.Runtime.exec(Runtime.java:485)
    at processing.app.exec.ProcessHelper.execute(ProcessHelper.java:84)
    at processing.app.exec.ProcessHelper.execute(ProcessHelper.java:64)
    at processing.mode.android.AndroidSDK.runADB(AndroidSDK.java:453)
    at processing.mode.android.Devices.list(Devices.java:295)
    at processing.mode.android.Devices.refresh(Devices.java:239)
    at processing.mode.android.Devices.findMultiple(Devices.java:184)
    at processing.mode.android.AndroidEditor$UpdateDeviceListTask.run(AndroidEditor.java:83)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)
Caused by: java.io.IOException: CreateProcess error=2, Systém nem?že nalézt uvedený soubor
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(ProcessImpl.java:386)
    at java.lang.ProcessImpl.start(ProcessImpl.java:137)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
    ... 11 more

Have I done something incorrect? Or have I to do something more?

Thank you for answers.