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Failed to launch com.apple.mobilesafari application on iPhone7Plus (12.1)

See original GitHub issue

The problem

WebDriverAgent fails to launch com.apple.mobilesafari, I’ve highlighted the main error but there are more details included in the logs in the Gist file.

[debug] [WD Proxy] Proxying [POST /session] to [POST http://localhost:8100/session] with body: {"desiredCapabilities":{"bundleId":"com.apple.mobilesafari","arguments":["-u","http://appium.io"],"environment":{},"shouldWaitForQuiescence":true,"shouldUseTestManagerForVisibilityDetection":false,"maxTypingFrequency":60,"shouldUseSingletonTestManager":true}}
[Xcode]     t =     0.91s Open com.apple.mobilesafari
[Xcode]
[Xcode]     t =     0.92s     Launch com.apple.mobilesafari
[Xcode]
[Xcode] 2019-01-03 19:24:20.133068+0000 WebDriverAgentRunner-Runner[981:136736] Enqueue Failure: Failed to launch com.apple.mobilesafari: The operation couldn’t be completed. Application "com.apple.mobilesafari" is installing or uninstalling, and cannot be launched. /usr/local/lib/node_modules/appium/node_modules/appium-xcuitest-driver/WebDriverAgent/WebDriverAgentRunner/UITestingUITests.m 37 1
[Xcode]
[Xcode] 2019-01-03 19:25:20.153958+0000 WebDriverAgentRunner-Runner[981:136736] Enqueue Failure: Application 'com.apple.mobilesafari' does not have a process ID /usr/local/lib/node_modules/appium/node_modules/appium-xcuitest-driver/WebDriverAgent/WebDriverAgentRunner/UITestingUITests.m 37 1

The WebDriverAgent is launching as expected and when I manually open Safari on my device, my scenario runs successfully. Would you be able to investigate please? I’ve included all the environment, configuration and log details below.

Starting the appium server appium -U {device_udid} -p4723 --webkit-debug-proxy-port 27753

Starting the debugger ios_webkit_debug_proxy -c {device_udid}:27753 -d

Environment

Appium version (or git revision) that exhibits the issue: 1.10.0
Desktop OS/version used to run Appium: MacOS High Sierra 10.13.6
Node.js version (unless using Appium.app|exe): 11.6.0
Mobile platform/version under test: 12.1
Real device or emulator/simulator: Real device (iPhone7Plus)

The Appium Server Logs in Gist

https://gist.github.com/NJewootah/dd215e2979d7328c9ea8fe109dd47e4b

The Desired Capabilities

capabilities.setCapability(MobileCapabilityType.DEVICE_NAME, "iPhone 7 PLus");
capabilities.setCapability(MobileCapabilityType.BROWSER_NAME, "Safari");
capabilities.setCapability(MobileCapabilityType.UDID, deviceName);
capabilities.setCapability(MobileCapabilityType.AUTOMATION_NAME, "XCUITest");
capabilities.setCapability("showXcodeLog", true);
capabilities.setCapability("startIWDP", true);
capabilities.setCapability("xcodeOrgId", "3******Y7");
capabilities.setCapability("xcodeSigningId", "iPhone Developer");
capabilities.setCapability(MobileCapabilityType.PLATFORM_NAME, "iOS");
capabilities.setCapability(MobileCapabilityType.PLATFORM_VERSION, "12.1");