I wanted to filter what is shown in the Android Studio Logcat to show what is relevant to my application only. I have chosen Show only selected applications
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In my case I used to use 2 Android Studio's (stable and canary) so the reason of the problem was this.
So, if you are running another IDE such as another Android Studio or Eclipse this could be the problem.
Solution: Close one of the IDE and if "Enable ADB Integration" is already enabled disabling and re-enabling solves it