Actually I am experimenting with Blender 2.80 and Eevee but Cycles produces same results:
I am trying to Mix/Add ObjectsInfo-Random feature and TextureCoordinate node to MAPPING node but no matter if its Add or Mix shader it produces famous pink objects…
Its even only inserting MIx or Add produces pink. Random does not interfere.
It’s because the wind is blowing to the east. Wait until tomorrow when the wind is blowing north and everything should be working fine again…
On a more serious note - at least meet us half way and post screenshots of your node setup and render result…or even a blend file so people can see what’s going on. Could you figure out what is wrong based on the little information you have posted?
Your object info and texture coordinate nodes are fed into a mix shader. You can only connect other shaders (glossy, diffuse, transparent etc.) to a mix shader. (Green input)