Can someone help me fix my mod?

[Cordelius]

I'm trying to make a mod where you can craft a field, and if you give it 10 butterflies it will change it's texture that adds some flowers to it (although I rather have it spawn 10 flowers on top of it. Normal and dark flowers. It would look more natural). It would be like a butterfly sanctuary of sorts. Butterflies would spawn at day and bees could get pollen from the flowers. If the player tries to damage the field or set it on fire, it would play a shadow animation and knock back the player. Mobs can't destroy it either. The only way to remove it is with a shovel and dig it and, by doing so, 10 butterflies would spawn and when placing the structure again you would need to give 10 butterflies again. This would useful to place down because players can pick the flowers on top of it, if the player still picks up all the flowers of his make and kill all the butterflies this is a way to ensure he still could get the butterfly wings. Also, since it is a craftable and you can place wherever you want, you could place it on caves and voila! Butterflies and bees in Caves, for example. Need a easy way for souls for Wortox? Place it down, give it down, give it 10 butterflies, place a bee box near, place Tingle Nodes around it all and you are ready to go!
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I tried using the Dark Butterflies and Onboard Garden mods to try make the "skeleton" of my mod, but it doesn't even shows the item in game. Can someone help me fix it?

 

Flower Field.zip