Make Array node can't able to connect with multiple actor bluprint object

hello every one. I am trying to connect multiple light bulb bluprint actors connect it to make array add pin nodes in to level bluprint so that i can change all light bulb material at once but i can only able to connect one bul blu print object to make array node. please help me and guide me where i am making mistake.

please elaborate what i need to check in all blu print object? as i didn’t found solution of it . in this new scene everything seems similar but still same error again. can’t able to connect multiple bluprint object to make array node