Not enough input arguments. m must be one of 0,1,2. TSPAN must have at least 3 entries. The entries of TSPAN must be strictly increasing. When M > 0, XMESH(1) must be non-negative. XMESH must have at least 3 entries. The entries of XMESH must be strictly increasing. Invalid output of ICFUN. ICFUN must return a column vector. Unexpected output of PDEFUN. For this problem PDEFUN must return three column vectors of length {0}. Unexpected output of BCFUN. For this problem BCFUN must return four column vectors of length {0}. Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative. Time integration has failed. Solution is available at requested time points up to t={0}.