Every time I add a texture with turbulence to an object in WED; when I try to build the level it just says:

-----CRITICAL ERROR-----
E003 - no visible blocks in map

It doesn't matter what texture I use, what size of texture I use, what object I put it on, if there are other blocks in the level with or without the same texture, or whether I change a normal texture to turbulence, or I use a preturbulenced texture from the standard.wad package. The same thing happens when I try to use a sky texture. I use the A7 commercial edition.

Please help. Thanks in advance.