# pyblp.exceptions.SharesByXiJacobianInversionError¶

class pyblp.exceptions.SharesByXiJacobianInversionError

Failed to invert a Jacobian of shares with respect to $$\xi$$ when computing the Jacobian (holding $$\beta$$ fixed) of $$\xi$$ (equivalently, of $$\delta$$) with respect to $$\theta$$.