UnassignedReferenceException: The variable _light of BloggerPhotoMaker has not been assigned.
You probably need to assign the _light variable of the BloggerPhotoMaker script in the inspector.
OfficeRiot.Gameplay.Blogger.BloggerPhotoMaker.OnMakePhoto (OfficeRiot.Gameplay.Blogger.Signal.MakePhotoSignal args) (at Assets/Scripts/Gameplay/Blogger/BloggerPhotoMaker.cs:51)
Zenject.SignalBus+<>c__DisplayClass31_0`1[TSignal].<SubscribeId>b__0 (System.Object args) (at Assets/Plugins/Zenject/OptionalExtras/Signals/Main/SignalBus.cs:212)
Zenject.SignalSubscription.Invoke (System.Object signal) (at Assets/Plugins/Zenject/OptionalExtras/Signals/Internal/SignalSubscription.cs:75)
Zenject.SignalDeclaration.FireInternal (System.Collections.Generic.List`1[T] subscriptions, System.Object signal) (at Assets/Plugins/Zenject/OptionalExtras/Signals/Internal/SignalDeclaration.cs:129)
Zenject.SignalDeclaration.Fire (System.Object signal) (at Assets/Plugins/Zenject/OptionalExtras/Signals/Internal/SignalDeclaration.cs:97)
Zenject.SignalBus.FireId[TSignal] (System.Object identifier, TSignal signal) (at Assets/Plugins/Zenject/OptionalExtras/Signals/Main/SignalBus.cs:82)
Zenject.SignalBus.Fire[TSignal] (TSignal signal) (at Assets/Plugins/Zenject/OptionalExtras/Signals/Main/SignalBus.cs:87)
OfficeRiot.Gameplay.Slot.SlotController.OnMakePhoto () (at Assets/Scripts/Gameplay/Slot/SlotController.cs:183)
UnityEngine.Events.InvokableCall.Invoke () (at /Users/builduser/buildslave/unity/build/Runtime/Export/UnityEvent/UnityEvent.cs:166)
UnityEngine.Events.UnityEvent.Invoke () (at /Users/builduser/buildslave/unity/build/Runtime/Export/UnityEvent/UnityEvent/UnityEvent_0.cs:58)
OfficeRiot.UITools.SpriteButton.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at Assets/Scripts/UITools/SpriteButton.cs:71)
UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at /Applications/Unity/Hub/Editor/2019.2.6f1/Unity.app/Contents/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/ExecuteEvents.cs:50)
UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at /Applications/Unity/Hub/Editor/2019.2.6f1/Unity.app/Contents/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/ExecuteEvents.cs:261)
UnityEngine.EventSystems.EventSystem:Update()