Getting the same issue too. Did anyone find the solution ?
if you just need to start the app, you can temporarily remove file app-embed.liquid from the blocks, after the app starts successfully, you can re-add it
Same issue guys… SHOPIFY WAKE UP !!!
Yes. I get this error too. It blocks my development. Please fix it ASAP
In our end, it does not update the app with the latest progress. May I know if it works normally in your end?
We are having the same issue!!!
Experiencing the same problem. I hope it gets fixed soon since it does not allow to build the extensions.
We’re also facing the same issue since this morning 
. The extension was working fine yesterday 
.
same issue.
I guess their developers made this change when they finished get off work at 9 PM. and then went home.
I wonder if they’ll be ‘surprised’ when they wake up in the morning, hahaha.
after reverting back, it is again throwing the same syntax error!
Possible workaround if you are not working on extensions is to set
extension_directories = []
in your shopify.app.toml. Personally I’m just working on some app home features right now so with this I’m able get the development preview running.
this worked for me thanks, i added all other extensions into the list.
Same issue, what’s going on?
We’re facing the same issue. Has anything changed recently?
Same here.
Is there any solution for those trying to work on a Theme App Extension?
I tried reverting to previous Shopify CLIs, but nothing worked 
We are having the same issue here with @Celine_Lamotte .
If you just want to run your app locally you can remove the liquid file and run the app and then paste it back. You’ll still get the error but at least you have a running instance, so you can focus on other stuff in the app.
If you want to test stuff with the extension though you’re out of luck 
Yes, correct, this doesn’t fix the issue; it is simply a workaround
Let’s wait for Shopify to release a fix for this