Texture Paint doesn't work I'm new to Blender and I was painting the texture of my model but I accidentally clicked on F mask brush and now I can't paint anymore. I do not know how to remove this I tried to restart Blender but it doesn't work.



Also when I start a new file it said that "Missing Data" something about texture slots.



edit: I have this brush selected. 



edit2: the first three are of the brush I want to paint, the other three are of the F Mask brush
In that first image, you do not show what tool you are using - cannot see the error here, other than you need to be sure you are using the correct paint tool.

Second image, you have to assign a new image texture to get a slot before you can paint - simply add one and you can begin painting so long as your canvas object has UVs.