crashes when loading worlds with custom_block behaviour pack [ pocket edition , android ]

Hello,

Recently i was trying to make a Addon to add some custom blocks
but when i add those resource pack and behaviour pack into it
my world and my game crashes.

I tried playing without it and it was perfectly fine and all my resource packs
still works.
I guess it has to do with the behaviour pack.

*There could be a issue with my pack or my device
but im not smart enough to figure it out.

so thanks for seeing into it;
and i searched for a similar issue but
couldn't find*