I had the same error without anything more happening, but then I noticed that I had Airplane Mode activated in the emulator. Turning it off solved the problem.

That is not an error message, actually. That is a sign that debugger is working all fine.

But if your debugger buttons (step over, step into, step out, etc) are disabled, then it means that your code doesn't execute the line at the breakpoint (at line 86 or whatever) you set. Take a look at the code below:

String jsonData = response.body().string();
Log.v(TAG, jsonData);
if (response.isSuccessful()) {
    mCurrentWeather = getCurrentDetails(jsonData);
} else {
    alertUserAboutError();
}

As you can see, if the response is not successful, then getCurrentDetails() is not going to be executed and that means you won't reach the breakpoint you set (because it is inside the getCurrentDetails() method). That means if you have problem with internet connection (possible reasons: airplane mode is on, mobile data is off, etc), you won't be able to reach the breakpoint.

[too long, didn't read] If your debugger buttons are disabled

• Make sure you have internet connection.
• Make sure your android system is not on airplane mode.
• Make sure your android system's mobile data is on.