Pink Textures when rendering more objects together

Hey Guys I realy need your help!

When I render all my objects together some of them are pink. When I render one of the pink objects alone (by pressing / ) it works fine. The links to the textures are not broken. The Problem only appears while rendering with my GPU. I’ve got an AMD Radeon R7 200 Series with 4GB VRAM. The problem does not appear while rendering with the CPU.
The previous Version of my project worked fine. I only did some changes on the material of some Objects. Strangely these objects don’t appear pink, exept one.

I thought, that my graphics card ran out of VRAM, but I think this is very unlikely.

I hope you can help me :slight_smile:

P.S.: Sorry for the bad english! :no: