# Ember-cli error on local MacOS development

**URL:** <https://meta.discourse.org/t/ember-cli-error-on-local-macos-development/222111>\
**Category:** Product Support\
**Created:** [March 27, 2022, 9:44pm UTC](https://meta.discourse.org/t/ember-cli-error-on-local-macos-development/222111 "2022-03-27T21:44:02Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![jimkleiber](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jimkleiber/32/121814_2.png) [@jimkleiber](https://meta.discourse.org/u/jimkleiber)\
**Post date:** [March 27, 2022, 9:44pm UTC](https://meta.discourse.org/t/ember-cli-error-on-local-macos-development/222111/1 "2022-03-27T21:44:02Z")

</div>

I’m trying to get Discourse up and running on my MacBook Pro. I was having troubles with Mojave but just upgraded to Monterey to see if that fixed the problem but it didn’t.

I’m able to start the rails server with `bundle exec rails server` but when I follow these instructions:

> [@Install Discourse on macOS for development](https://meta.discourse.org/t/install-discourse-on-macos-for-development/15772/1):
>
> In a separate terminal instance, navigate to your discourse folder ( `cd ~/discourse` ) and run:
> 
> ```plaintext
> bin/ember-cli
> 
> ```

I get the following error:

```plaintext
[DEPRECATION] The trollop gem has been renamed to optimist and will no longer be supported. Please switch to optimist as soon as possible.
Error: unknown argument '-s'.
Try --help for help.

```

Anyone know what might be happening? Any additional info I could provide to help figure out what might be going on?

---

_[View the full topic](https://meta.discourse.org/t/ember-cli-error-on-local-macos-development/222111)._