Q: I'm getting a ton of "Unable to find the DECORATE class '[some actor]' to inherit from, while parsing '[some other actor]:[DoomEdNum]'" warnings. What's wrong?
A: This happens when a DECORATE actor is inherited from another actor, which is not defined in game configuration and is not defined in any included resources. To fix this, add "(g)zdoom.pk3" as a map resource. Don't forget to check "Exclude from testing parameters" chekbox while adding it, otherwise (G)ZDoom won't load your map. "(g)zdoom.pk3" can be found in (G)ZDoom folder.
Q: I'm getting a ton of "Light declaration not found for light '[light name]' ('[source]', line [n])" warnings. What's wrong?
A: GZDoom Builder doesn't include GZDoom's GLDEFS lights definitions. To get rid of these errors, add "lights.pk3" as a map resource. Don't forget to check "Exclude from testing parameters" chekbox while adding it, otherwise GZDoom won't load your map. "lights.pk3" can be found in GZDoom folder.
Q: When I create a new map, I see only Doom-related game configurations. Where are configurations for other games?
A: Copy "[EngineName]_[Game][MapType].cfg" and "Includes" folder from "[GZDB]\Configurations\Configs for other games\[Game]" to "[GZDB]\Configurations\".
If you are using Zandronum, you'll also need to copy all files from "[GZDB]\Configurations\Configs for other games\Zandronum Includes\" to the main "Includes" folder ("[GZDB]\Configurations\Includes\") .