Information

Minecraft version: 1.21.1
Modloader: NeoForge
NeoForge version: 21.2.119
Environment: Singleplayer

Mod name: Starter Structure
Mod version: 4.0

Description

I followed the steps of the tutorial. I included a lot of modded blocks in the structure.
After i finished the steps in the guide i generated 3 new worlds and none of them have the structure,
In the log i get this message:

[Starter Structure] Generating starter structure with 0 blocks.

Could you upload the schematic file you're using here? And a screenshot of the config folder and path where you've got the file?

I'm having the same problem. I even tried a schematic without any modded blocks, on clean instance. Fabric 1.21.1 btw.
Github doesn't let me to upload .schem file here.

Github doesn't let me to upload .schem file here

Can you please zip the schem file you're trying to upload and upload the resulting zip file instead?

There you go. First one has one custom bed from Traveler's Backpack mod. In second schematic I changed it to be vanilla bed.
schematics.zip