Android Device Monitor doesn't open - error on log file

If you are on windows try opening your Android Studio in Administrative Mode (Run as administrator)

I encounter this problem before. I fixed this issue by killing or ending "monitior.exe" running process using Taskmanager in Windows. Then click ADM (Android Device Monitor) and it works

I had the same issue with Mac OS X.

To solve it:

• Open a terminal window
• Navigate to your SDK
• Locate the 'tools' folder
• cd into it
• run: sudo ./monitor
• Type in your password

Good to go!