crashing when I click spawn

[ShadowBlitz16]

I keep crashing when I click spawn. I used some custom blocks and they were just fine but the recent update messed it up. I did reinstall everthing but it still does it.

it says ArreyIndexOutOfBoundsException: 420

can someone tell me how to delete blocks in my world and clear my inventory

 

[MonkeyMan12]

I think you\'ll have to reset your universe, thats all i can say.