Issues In Looking At Maps

Whenever I try to open up an srb2 map, My Zone Builder says it can't scan the textures of the map, saying that the textures are unknown. I use Zone Builder 2.5 and I have the 2.1.16 patch update. My computer is also 32 bit(if that really matters.) Is this an issue with my computer, or is there something I'm missing?

Did you set the IWAD for the Sonic Robo Blast 2 v2.1 Game configuration first?

If you're not sure how to do what I said, check here: https://wiki.srb2.org/wiki/Zone_Builder_tutorial/Getting_started#Installation_and_setup

I just learned now from someone to do that. So I'll be deleting this post.