# Cannot Start on iOS in Mobile recorder

**URL:** <https://forum.katalon.com/t/cannot-start-on-ios-in-mobile-recorder/59847>\
**Category:** Mobile Testing\
**Tags:** mobile-testing, katalon-studio\
**Created:** [November 8, 2021, 6:42am UTC](https://forum.katalon.com/t/cannot-start-on-ios-in-mobile-recorder/59847 "2021-11-08T06:42:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![chunkit.ip](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/chunkit.ip/32/16104_2.png) [@chunkit.ip](https://forum.katalon.com/u/chunkit.ip)\
**Post date:** [November 8, 2021, 6:42am UTC](https://forum.katalon.com/t/cannot-start-on-ios-in-mobile-recorder/59847/1 "2021-11-08T06:42:52Z")

</div>

Hello,

I followed the tutorial of iOS Setup but still cannot start the Mobile recorder on iOS.

Thanks,  
Kit

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 127.0.0.1:57244  
Build info: version: ‘unknown’, revision: ‘unknown’, time: ‘unknown’  
System info: host: ‘iMac.local’, ip: ‘’, os.name: ‘Mac OS X’, os.arch: ‘x86\_64’, os.version: ‘10.16’, java.version: ‘1.8.0\_275’  
Driver info: driver.version: IOSDriver  
remote stacktrace: UnknownError: 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 127.0.0.1:57244  
at getResponseForW3CError (/usr/local/lib/node\_modules/appium/node\_modules/appium-base-driver/lib/protocol/errors.js:826:9)  
at asyncHandler (/usr/local/lib/node\_modules/appium/node\_modules/appium-base-driver/lib/protocol/protocol.js:447:37)