I'm new modding, so I've simply made a single block + item with no texture, following Mcjty's 1.14 tutorial. The game seems to load normally; however, when I use the /give command to give the item to the player, the game seems to crash. The crash log was quite unhelpful -- though I've attached it to this post, of course, it essentially just says "unexpected error occurred". Since the crash only occurs when the game has to interact with the item, I assume I've made some obvious and common mistake registering it, or else Eclipse or Gradle somehow aren't building Minecraft quite properly.
Here is what I think the relevant code might be:
Main mod class:
FirstBlock.java
ModBlocks.java
Thank you kindly for any advice.
crash-2019-07-08_20.26.20-client.txt