xcodebuild prints this as the recovery suggestion for Unable to Install "WebDriverAgentRunner-Runner". Mobster shows Delete an app you installed with Xcode from your iPhone. A free Apple Account allows 3.
Why it happens
iOS caps apps signed by a free Apple Account at 3 on the phone. Waiting never frees a slot; deleting an app does.Fix
- On the iPhone, delete an app you installed with Xcode: touch and hold its icon, then Remove App › Delete App.
- Install Mobster’s helper again from Mobster for Mac (Devices), or run the guided setup’s
setup /build.
Check it worked
The install finishes andmobster doctor prints ✓ WebDriverAgent. A paid developer team has no such cap.
Checked 26 Oct 2026 against Mobster 0.4.0. Back to Troubleshooting.