"Please close other application using ADB" when trying to debug Android device

IJ 11.1.2, Ubuntu something-or-other.

I've created a USB debugging profile, and I've got a device connected. Whever I try to attach the debugger, I get the following:

Waiting for device.
Target device: LG-LS840-200137b
Warning: debug info can be unavailable. Please close other application using ADB: DDMS, Eclipse
Waiting for process: com.youmail.android.itson.vvm

I don't have eclipse running, and the only other thing I can think of that might be using ADB is IJ itself.

Note that I can debug on an emulator just fine, it's only when using the USB connection to a real device that I can't do it. I can do adb command line stuff, like install, logcat, etc., but can't connect debugger through IntelliJ.

Thanks in advance for any help!