So have been making a level on hl2 ep2 editor when suddenly the best choice was to change it to hl2 editor. So what i did is save the map to a new name.
So then i start open up the hammer editor for hl2 then open the map and press the F9 button to test the map, and while it’s loading to the game it stops at the menu in hl2 with this code:
CModelLoader::Map_IsValid: No such map ‘maps/hl2_sp_1.bsp’
map load failed: hl2_sp_1 not found or invalid