So, in my recent projects I have this warning. This warning also appear in the console when the engine enter Project List. In the description it says about sRGB, so I assume that something wrong with the images (including the project icon, so warning appear in the Project List too), but i dont know. (Note: The images created with GIMP)

And when i run one of my project, the errors below always accompanying the warning. I dont know it is related or not.

So, what is this Warning or Error about?
BTW, This is my machine (Laptop):
CPU: Intel i3
GPU: nVidia
OS: Win 8.1 Pro
Godot Version: 2.0 stable (The official stable build)