Hello !!! Your problem comes from the fact that the CBC packages got updated very recently, and is compatible with the brand-new implementation of the MIP class in Sage... I guess you need to use the last Alpha version of Sage, or to wait until the next stable version is released. Sorry for the inconvenience... This update is not backward- compatible.. It comes from the fact that LP in Sage is pretty new, but should not happen anytime soon :-)
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