No episodes in Castos Player Block

I tried to use the Castos Player Block but the meny for selecting episodes is empty. Is there some setting I’ve missed?

The console shows a TypeError when the block i loaded in the editor:

index.js?ver=512fffea51bf5725831b:1 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'rendered')
    at index.js?ver=512fffea51bf5725831b:1:23136
    at Array.map (<anonymous>)
    at index.js?ver=512fffea51bf5725831b:1:23084

The script is seriously-simple-podcasting/build/index.js