Shopify Theme Dev gets ruby: invalid switch in RUBYOPT: -F (RuntimeError)

Retired Boards Appdev Tools
1

Hello,

I am just getting started with CLI. I want to learn how to create custom themes and am following the steps here:

https://shopify.dev/docs/storefronts/themes/getting-started/create

Everything went as expected until I reached “Step 2: Start a local development server”. When I run the command shopify theme dev --store {store-name} with my development store name replacing {store-name}, I get the following error:

ruby: invalid switch in RUBYOPT: -F (RuntimeError)

I’ve tried using just the store name, storename.myshopify.com, and https://storename.myshopify.com, all to no avail.

I don’t know anything about RUBY and Google has turned up little-to-nothing helpful outside of updating the bundler to the latest version.

Any ideas or help would be greatly appreciated.

2

What version of Ruby do you currently have installed on your machine? It should be version 2.7.5 or higher.

3

Hi Liam,

Thanks for replying.

I’m running 3.3.4. Here’s the output: ruby 3.3.4 (2024-07-09 revision be1089c8ec) [x64-mingw-ucrt]

Robb

4

It’s amazing what a few hours of sleep will do.

I found a solution first thing in a tab I had open on my browser from last night. I was just about to close it, when I caught the title of the search result.

Turns out to be user error, as expected. I installed Ruby in the C:\Program Files folder instead of C:. The extra space in Program Files was causing the error. I ran a complete uninstall and re-install and the issue is resolved.

Liam, thanks again for your quick reply.

Robb