Welcome to Shopify Community. My name is Olivia and I work here.
Thank you for sharing your question with our network. I did quite a bit of research for you, and I wasn't able to replicate the error you are experiencing. With that being said, as it turns out we did experience some temporary hiccups in service (shopifystatus.com/) around the time frame you posted your question. Let's rule this out as a potential cause by trying the following:
If you are still running into this error at that point, please grab me screenshots of your experience as well as timestamps and I'd be more than happy to troubleshoot further with you.