its hard to say whats wrong as you give so little information to work with. you say it doesnt work, how does it not work? as in what do you intend to do that it doesnt and or what does it do that its not meant to? where is the script that you show located (i assume in the character)? how are you setting the reference? what type / class is your new var 0? are you manually attaching the flashlight to the character or are you spawning it at runtime?
theres two reasons i would guess that your saying it doesnt work: first its probably not running the custom event, that issue is probably due to not setting your variables value to a valid actor. the second thing is youve probably noticed the warning on the cast, this warning likely just says that the cast is redundant (usually that would be a note however so it may say something different). if the warning is indeed saying the cast is redundant thats because you already know the class of the linterna so no need to cast.