500 error, ideas on investigating?

How to best troubleshoot a 500 error? I was running my app fine yesterday then submitted it for testing, this morning I run the app again and I ran into a 500 as soon as I ran npx shop-minis dev.

Hey! Is this issue still occurring? If so could we get some more information please? Could you give us the info requested in Shop Minis Support Template - Required for all issue reports and we will take a look