Delta vs. Iceberg Table Creation in External Catalogs: Understanding Static-Facade Error

[sathesuraj]

I am evaluating table catalog and table creation using FILE storage.
I can create an external catalog and successfully write Delta format tables to it. However, when I try to create an Iceberg table in the same external catalog, I get the following error:

"Cannot create table on static-facade external catalogs."

Why does this error occur when creating Iceberg tables in external catalogs? What is the difference between Delta and Iceberg table support in external / internal catalogs.