Hi guys. So, I'm trying to add a block to the inventory. My problem is how to put the "fallback block". It says that I can put the block ID or block name. So I added a block ID and it says that it is not valid. What could I put so I can go forward? Thank you.

Can you explain a bit more about what a falling block means?

Here, I typed the block id. (pic 1)

Then it says that custom blocks cannot be used as fallback blocks. (pic 2)

Fallback block means what players see if they dont support custom blocks. It has to be the closest block from 1-65

Thank you!! I can now add a custom block!!

you could of just did  /os lb copy  then do  /os lb edit [id] alltex/sidetex/lefttex/toptex/bottomtex/ect...

 

if you want any extra help feel free to hit me up or you can use this tutorial https://www.classicube.net/forum/viewpost/6048-custom_block_creation_a_user39s_field_guide/