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I have the same problem...I think I mixed the soap types (Enzyme based with Bleach based). The manual clearly says not to do this.
What I did was brought out my trusty wet-vac and sucked it out while using HOT water to break up the crusty mess. I am going to fill the dispenser with water and add soap the old way until I see the "low soap" light go on.
I'll keep you posted if this happens.