Found this error in \blender\intern\cycles\render\nodes.cpp
NODE_DEFINE(SeparateRGBNode)
{
NodeType* type = NodeType::add("separate_rgb", create, NodeType::SHADER);
SOCKET_IN_COLOR(color, "Image", make_float3(0.0f, 0.0f, 0.0f));
SOCKET_OUT_FLOAT(g, "R");
SOCKET_OUT_FLOAT(g, "G");
SOCKET_OUT_FLOAT(b, "B");
return type;
}obviously code should be:
SOCKET_OUT_FLOAT(r, "R");