# Xcode exit code 65

**URL:** <https://discuss.circleci.com/t/xcode-exit-code-65/4284>\
**Category:** Mobile\
**Tags:** xcode\
**Created:** [May 31, 2016, 11:35am UTC](https://discuss.circleci.com/t/xcode-exit-code-65/4284 "2016-05-31T11:35:02Z")\
**Posts on this page:** 1\
**Showing post:** 31

<div class="post-metadata">

**Author:** ![alexey](https://sea2.discourse-cdn.com/circleci/user_avatar/discuss.circleci.com/alexey/32/42_2.png) [@alexey](https://discuss.circleci.com/u/alexey)\
**Post date:** [January 16, 2017, 10:08am UTC](https://discuss.circleci.com/t/xcode-exit-code-65/4284/31 "2017-01-16T10:08:07Z")

</div>

We no longer recommend using UUIDs to start simulators. The OS X image has been updated to resolve the underlying issue with multiple simulators available for the same device type and iOS version, and using UUIDs is no longer necessary. Please check out [this post](https://discuss.circleci.com/t/os-x-build-image-update-xcode-8-2/9355) for examples of how to choose the simulators by name, both in `xcodebuild` commands and when pre-starting the simulator.

---

_[View the full topic](https://discuss.circleci.com/t/xcode-exit-code-65/4284)._