  A family of holomorphic vector bundles is constructed on a complex manifold
$X$. The space of the holomorphic sections of these bundles are calculated in
certain cases. As an application, if $X$ is an $N$-dimensional compact K\"ahler
manifold with holonomy group $SU(N)$, the space of holomorphic vector fields on
its jet scheme $J_m(X)$ is calculated. We also prove that the space of the
global sections of the chiral de Rham complex of a K3 surface is the simple
$N=4$ superconformal vertex algebra with central charge $6$.
