Unable to retrieve data using proxy URL

[Eranga23]

I've been trying to retrieve data from the Prisma database, where I have already stored data for my theme extension app. Previously I made a theme extension app in my development store, and it worked without an issue by retrieving data and being able to fetch that data into my liquid code. I've created another similar app with several models in Prisma. Even though it stores the data, I can't retrieve data using the Shopify proxy URL. But the previously developed theme extension sample still works well. What can be the reasons for this issue? How can I solve this issue?