No textures on blocks

[past pumice]

It's my first time making an add-on. It's meant to add 3 blocks but all of the blocks have no textures. How do I fix that?

This is the add-on

[daring flower]

ERROR IN YOUR terrain_texture.json

Your file is not closed properly.
2 curly braces } are missing at the end.

It’s only a careless mistake, nothing very mean