I downloaded the GreetingCard example and I simply renamed the folder and updated the "mainLibrary": name in library.json file and the name in h5p.json file name. I tried reloading it, but I get an error. What else do I need to change? I changed the folder name to Greet and zipped using command line. It works if i dont change the library name or anything else. I want to know what else do I need to modify.