Database Table empty

I'm currently working on Step #5 of the "Build an Application (Step-by-Step Acme Auto)" guide. When attempting to configure the data source, there are no database tables available to select.

 

Additionally, I noticed that in the Acme Auto solution application, when I select the Vehicle record type, a banner appears at the top stating:

"The data source cannot be reached or its configuration is invalid."

I'm not sure if this is related to the issue, but I wanted to mention it in case it helps with troubleshooting.

Any assistance you can provide would be greatly appreciated. Thank you!

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