Actually, the error explains itself. Please check them and I suggest you check your blueprints.
UATHelper: Packaging (Windows): LogWindows: Error: Can't save C:/Users/kyle/Development/Game Development/LUXR/Saved/Cooked/Windows/LUXR/Content/SD_Art/Oil_Rig/Maps/Oil_Rig_Optimized.umap: Graph is linked to object BP_Julie_C /Game/Modern_Office/Maps/L_Showcase.L_Showcase:PersistentLevel.BP_Julie_C_1
PackagingResults: Error: appError called: Can't save C:/Users/kyle/Development/Game Development/LUXR/Saved/Cooked/Windows/LUXR/Content/SD_Art/Oil_Rig/Maps/Oil_Rig_Optimized.umap: Graph is linked to object BP_Julie_C /Game/Modern_Office/Maps/L_Showcase.L_Showcase:PersistentLevel.BP_Julie_C_1