Kalanchoes problem

Hi
I am keeping a pot of Kalanchoe.
However, these days, there is mold around the stem of my kalanchoe.
Please see the following photos.
http://i50.photobucket.com/albums/f330/joanjoan610/photos/Kalanchoes_mould_full.jpg
http://i50.photobucket.com/albums/f330/joanjoan610/photos/Kalanchoes_mould.jpg
Would you please advice me how to solve the problem?
Thank you very much!
Yours sincerely,
Joanne
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