Hi
First try turning the big knob in the bean hopper to 18, then the small knob to the minus -. If that doesn't work you have a blockage in you grind passage. Try removing the brew group. Then inside on the roof of the machine where the brew unit was setting there is a drop chute where the coffee is dropped into the brew unit. From the left side of the drop chute pull down and back, and it will drop coffee. This will clear an opening that relieves pressure on the passage. There is a passage inside the drop chute area that goes to the grinder. Vacuum it out. It will be on the backside of the drop chute.
Once that is cleared go to the bean hopper. There are 2 knobs in the bean hopper. Turn the large knob to the largest number. You can turn the knob to a larger number any time but it has to be grinding to turn to a smaller number. Now replace everything and make your coffee. Once you have made your coffee you can turn the knob back to a number that was higher than the one you had it on before, but only when the grinder is running. Turn the small knob up to the + then back 1 mark for a strong coffee.

This is what it looks like when it says out of beans and there are beans in the hopper