Apart from the material being too thick for the 3 mm. bowden tube and hot end of the UM, it has been reported that you need to print extremely slow with flexible material (10-20 mm./s.), disable all retraction and add a little bit of oil to the bowden tube to remove some of the friction from the rubbery material
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Dim3nsioneer 558
It looks to me as if the material is thicker than 3.00mm which is the absolute maximum thickness with an Ultimaker. If the material is thinner, there are some ways to get also a flexible material to slip through the Bowden tube.
Maybe you have a look at this thread: http://umforum.ultimaker.com/index.php?/topic/3440-advice-for-flexible-material/
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