I fucked up. Was gonna save a prefab and made a new folder inside of my "map_source" instead of saving it in my "_prefabs" folder.
When I try to compile the map I get the following message:
   
    ERROR:
    Map C:/Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III\\map_source\zm\zm_factory.map, Entity 0, Brush 173:  Material with 0
    texture scale.
    Open and re-save 'C:/Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III\\map_source\zm\zm_factory.map' from Radiant to fix this.

I am unable to start Radiant with the map selected doing so results in these two messages:

    EntityDef::parse: { not found
    GetLastError() = 0
    Would you like to edit Preferences before exiting Radiant?

and

    (name.length() > 0)

    C:/Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III\bin\radiant_modtools.exe
    q:/t7\pc\code\tools\radiant\eclass.cpp:1615

Does anybody know how I can fix this so I can at least manage to open my map with Radiant?