Unable to find a destination matching the provided destination specifier - Mobster

You see this: xcodebuild prints this line when Mobster builds its helper (WebDriverAgent, the WebDriverAgentRunner scheme) for your iPhone, during setup or a refresh.

Why it happens

Xcode found no destination it can build for. The lines under it, headed Ineligible destinations, say why. Two causes are recorded in Mobster’s tests:

The line under it ends	The cause
`error:Developer Mode disabled To use … for development, enable Developer Mode in Settings → Privacy & Security.`	Developer Mode is off on the iPhone.
`error:iOS 26.4 is not installed. To use with Xcode, first download and install the platform`	Your Xcode doesn’t have the iOS version your iPhone runs.

A locked phone, an unplugged cable or a Mac the phone doesn’t trust yet also leave Xcode without a destination.

Fix

Unlock the iPhone, keep it connected and tap Trust if it asks.
If the line under it says Developer Mode, follow Developer Mode disabled.
If it says an iOS version is not installed, open Xcode and let it finish installing: Settings › Components › iOS. Update Xcode if your iPhone’s iOS is newer than it.
Build again from Mobster for Mac, or run mobster doctor.

Check it worked

mobster doctor prints a line for each of these, with the fix under any line marked ! or ✗. Checked 26 Oct 2026 against Mobster 0.4.0. Back to Troubleshooting.