Can't build light (4.1.1)

On MacBook Pro 10.9.2 when i build lights freeze at 0%…

i7 quad 2.2 ghz 8gb ram AMD radeon 6750m 1 gb

Help Please

Sorry for my bad english (italian)

If it’s a build you compiled yourself, you need to build UnrealLightmass as well. If you’re using binary build installed via the Launcher, I’ll need more info. For starters, check if there are any crash logs from UnrealLightmass in ~/Library/Logs/DiagnosticReports.