Accessed None 'Directional light actor' from node

I currently have a couple of errors popping up in the image shown. Accessed None ‘Directional light actor’ from node Set Vector Parameter Value in graph ‘UpdateSunDirection’ in blueprint BP_Sky_Sphere. I’m not sure how to fix this I’m new to blue prints. The event is in the level Blue print area. I’m trying to change the time of day to night. Right now it will only go to dusk.