General Question how to have my lava lakes light up at night.

[Foofoo14]

So i just finished a land mask and bitmap of a planet and i wanted the lava on its surface to glow at night, but when i was done with pltex it turns out that the bin file wasn't 1 kilobyte and the land mask for the bin was 0 bytes.
How is this so and how can i get it to work?