problem with floors. PLEASE HELP!

[kiro the hedgehog]

so i was trying to change the ground/floor in a level wad and this always happens:

the sand is weird!!
do someone knows how to fix this problem?

 

[Kalaron]

You could have not set the lump to the correct type, 32. You may have also forgotten to save it as Doom Flat, do this by clicking on the lump in XWE, selecting Image in the toolbar and saving it as a Doom Flat, you also need FF_START and FF_END makers at the beginning and end of the floor lumps.

 

[kiro the hedgehog]

you really helped me!!

thanks man!

 

[Kalaron]

You're Welcome. (: