Cannot get 'xml' source of the current application in Appium Inspector by using WebDriverAgent

[Jjoga143]

When I have tried to inspect a particular page having webservice calls on UI elements of an IOS app in iPhone X simulator, the app crashes, appium inspector throws the error as follows and the app gets closed.

Error in Appium Inspector window -
Could not obtain source: {“cause”:{“sessionId”:“28833cee-e0ea-4a9d-abac-eca0d2f7ad88”,“status”:13,“value”:{“message”:“An unknown server-side error occurred while processing the command. Original error: Cannot get ‘xml’ source of the current application”}},“jsonwire-error”:{“detail”:“An unknown server-side error occurred while processing the command.”,“status”:13,“summary”:“UnknownError”},“message”:"[source()] Error response status: 13, , UnknownError - An unknown server-side error occurred while processing the command. Selenium error: An unknown server-side error occurred while processing the command. Original error: Cannot get ‘xml’ source of the current application",“status”:13}

Environment -
I am running Appium Desktop version _1.7.1. in Mac
Automating platform - IOS 11.4
WebDriverAgent used - cloned from https://github.com/facebook/WebDriverAgent/
Appium version - latest version 1.9.1
Appium Desktop version - latest version 1.7.1
iPhone X IOS simulator
The language used for writing tests - NodeJS , webdriverIO
System OS - Mac OS X High Sierra 10.13.6

[ManituPC]

I also get this error, but when I try inspect screen with 3D model
Could not obtain source: {"cause":{"sessionId":"f4c2efae-5ef3-4242-a7dc-18a6c19b1ca0","status":13,"value":{"message":"An unknown server-side error occurred while processing the command. Original error: Cannot get 'xml' source of the current application"}},"jsonwire-error":{"detail":"An unknown server-side error occurred while processing the command.","status":13,"summary":"UnknownError"},"message":"[source()] Error response status: 13, , UnknownError - An unknown server-side error occurred while processing the command. Selenium error: An unknown server-side error occurred while processing the command. Original error: Cannot get 'xml' source of the current application","status":13}

[hrabkin]

I found out recently that this error happened to me because of used accessebilityIdentifiers on elements without any values specified, empty. By removing them it backs to work normally