matlabR2009a符号运算为什么不能使用？

下面的报警是什么意思？我这个matlabR2009a符号运算为什么不能使用？
>> syms a b
>> f=a+b
??? Error using ==> mupadinit at 35
Unable to initialize kernel

Error in ==> mupadengine.mupadengine>mupadengine.evalin at 119
[res,status] = mupadmex(statement);

Error in ==> mupadengine.mupadengine>mupadengine.feval at 157
[S,err] = evalin(engine,stmt);

Error in ==> mupadfeval at 24
[S,err] = feval(symengine,cmd,varargin{:}); % returns sym

Error in ==> sym.plus at 27
X = mupadfeval('_plus',A(:),B(:));

>> syms x y
??? Error using ==> mupadinit at 35
Unable to initialize kernel

Error in ==> mupadengine.mupadengine>mupadengine.evalin at 117
[res,status] = mupadmex(statement,8);

Error in ==> D:\MATLAB\toolbox\symbolic\symengine.p>symengine at 29

Error in ==> sym.sym>sym.sym at 94
eng = symengine;

Error in ==> syms at 77
assignin('caller',x,sym(x));

你装得是64bit版本吧，应该是没有符号运算工具箱，2012的都有了，用新版的吧。

weofferyoutwowaystolicensematlabr2009a: standalone 1)choose"installmanuallywithoutusingtheinternet" 2)enterthe"fileinstallationkey"

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