In this Erratum we point out and correct an omission of an important term in Eq. (8) of our original paper. This equation was a statement of the conservation of angular momentum and we inadvertently omitted the electrical body couple term that is needed in this momentum balance. In Eq. (9) the electrical body force components biE are defined. A similar equation is needed to define the electrical body couple as 
ciE=ϵijkσjkM
Then, the correct statement of the balance of angular momentum and its analysis is given as 
VciEdV+Vϵijkxj(bk+bkE)dV+Sϵijkxj(Tk+TkE)dS=ddtVρϵijkxjvkdV,
 
formula
 
formula
 
formula
 
Vϵijk(σjk+σjkM)dV=0
The result of this analysis appears in Eq. (13) of the original manuscript as 
σji+σjiM=σij+σijM
Note that Eq. (13) does not follow from the original Eq. (8), but does follow from this corrected version. Hence, Eq. (13) and all of the remaining equations within the original manuscript are correct.