Now after I've removed that, I try to compile the map but it says "ERROR: Can't load map.pcx", altho that .pcx is almost every folder already .
And about the texture problem - when I made the terrain I used 3 levels terrain with 2 snow textures. Now when I compile the map it says WARNING: Couldn't find image shader textures/mapname/terrain_0 WARNING: Couldn't find image shader textures/mapname/terrain_0to1 WARNING: Couldn't find image shader textures/mapname/terrain_1 WARNING: Couldn't find image shader textures/mapname/terrain_1to2 WARNING: Couldn't find image shader textures/mapname/terrain_2 WARNING: Couldn't find image shader textures/mapname/terrain_2to0
And if I go to ET and run the map, the terrain texture is missing (it's just that default texture black box with orange frames).
The .pcx file goes to your etmain folder. For the image missing, check the path to the picture, if the picture is there, make sure they are non compressed 32 bit tga's with full alpha channel.
Also when you want full bright without shadows, remove the whole light and do just single bsp meta and vis if you need to (atleast for release). If you want to have shadows and full bright, just make the normal light compile, but add _ambient key to your worldspawn, value like 10 should be good, play around it so you'll get one for your needs.