Hm, probably your openCL device doesn’t support textures or you’re running with the CPU fallback.
If you have a CUDA capable card it is better to use RT CUDA, because it is more stable.
I think we don’t support projection textures on the GPU, yet.
What version are you running?
These are not errors, just ignore them.
RT GPU always does Brute Force GI and Shadows.
Generally we try to make them identical, but sometimes there are differences