My white ink paint nouns won't write any more, how to procure it working again?

I used it only twice, consequently left it unused for a few months. Now it won't write no event what I try (shake well, remove boater, pump, again and again). It's an Edding 780 paint marker 0,8 mm.

Answers: spend 2 bucks and buy a alien one.

It dried out you need to purchase another.