  We correct two errors in our paper [4]. First error concerns the definition
of the SVI solution, where a boundary term which arises due to the Dirichlet
boundary condition, was not included. The second error concerns the discrete
estimate [4, Lemma 4.4], which involves the discrete Laplace operator. We
provide an alternative proof of the estimate in spatial dimension $d=1$ by
using a mass lumped version of the discrete Laplacian. Hence, after a minor
modification of the fully discrete numerical scheme the convergence in $d=1$
follows along the lines of the original proof. The convergence proof of the
time semi-discrete scheme, which relies on the continuous counterpart of the
estimate [4, Lemma 4.4], remains valid in higher spatial dimension. The
convergence of the fully discrete finite element scheme from [4] in any spatial
dimension is shown in [3] by using a different approach.
