How to reset MARKOV widget?

from some reason the markov widget my old freind has gone dead. it functions very bad and has no real content to advise me while im working , not to mention it regarding the 10 options prediction , and from time to time gives 1 - 3 options.

i dont know if other have this issue after the latest update, but would love to reset it. i tried to delete the markov file, but in vain.