Syms Not Working Error using mupadmex

Typing syms x y z into the command prompt results in this error:

Error using mupadmex
Error in MuPAD command: Slot
'symobj::matrix' is unknown. [slot]

Error in sym>cell2ref (line 1281)
S = mupadmex(y);

Error in sym>tomupad (line 1219)
    S = cell2ref(numeric2cellstr(x));

Error in sym (line 179)
                S.s = tomupad(x);

Error in syms (line 144)
toDefine = sym(zeros(1, 0));