tree Blob Light Projector Problem

ok im for a comedy game,but there is 1 problem, and error says The tree Blob Light Projector couldn't be instanced because the prefab contains no valid mesh renderer UnityEditor.DockArea:OnGUI()

after some research,i found out that its a kind of tree's or something,i placed a tiny drop and THE ERROR came up i removed it,then i relized its ok,but i cant find the first light projector