# WebDriverAgent failed to build: Assign property / Could not build RoutingHTTPServer

**URL:** <https://forum.katalon.com/t/webdriveragent-failed-to-build-assign-property-could-not-build-routinghttpserver/33859>\
**Category:** Mobile Testing\
**Tags:** mobile-testing, katalon-studio\
**Created:** [September 27, 2019, 10:10am UTC](https://forum.katalon.com/t/webdriveragent-failed-to-build-assign-property-could-not-build-routinghttpserver/33859 "2019-09-27T10:10:47Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![fap](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/fap/32/23869_2.png) [@fap](https://forum.katalon.com/u/fap)\
**Post date:** [October 1, 2019, 3:32pm UTC](https://forum.katalon.com/t/webdriveragent-failed-to-build-assign-property-could-not-build-routinghttpserver/33859/17 "2019-10-01T15:32:10Z")

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@duyluong

java.util.concurrent.ExecutionException: org.openqa.selenium.SessionNotCreatedException: Unable to create a new remote session. Please check the server log for more details. Original error: An unknown server-side error occurred while processing the command. Original error: Unable to start WebDriverAgent session because of xcodebuild failure: An unknown server-side error occurred while processing the command. Original error: Could not proxy command to remote server. Original error: Error: connect ECONNREFUSED 127.0.0.1:60768

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