My game crashes whenever I switch resorce packs!

My game crashes whenever I switch resorce packs

What I expected to happen was to easily switch packs
I thought this because thats how texture packs worked

What actually happened was my game crashed once I switched packs
I did esc., resource packs, default, (I was switching out of my texture pack) and then the came closed

Steps to Reproduce:
1. Press escape
2. Press resorce packs
3. Switch packs