Blueprint reader wont take material

my blueprint reader wont take materials required to make product. I have the skill level and its looking where product is. I cant drag mineral or whatever i need in material slot for bp either. It used to work.

Perhaps you should manufacture a hammer to hit it with?

If your material is in a container, you must tell the manufacture window where it can find the material.
If the wrong containment is chosen, it looks like there were no minerals at all.