Ultimate Doom builder can't find maps after editing the WAD with SLADE

[Gianluco]

I've tried looking around but I can't seem to find a solution to this, does someone know what's happening?

[jaeden]

You have Mapinfo and Textures lumps infiltrating inside the map sequence (before Endmap lump). They should be outside the map.

[Edward850]

You placed the lumps MAPINFO and TEXTURES inbetween MAP01 and ENDMAP, do not do this. All lumps between MAP01 and ENDMAP must actually belong to the map.

[ramon.dexter]

Yeah, if you've used pk3 as project storage, this would never happen to you.