matlab 2009a 无法运行solve

[chenjf]

matlab2009，一个简单的solve都不能用，新手求助
随便跑个例子，包括help文档里面的，为什么都不能用呢，我是新手，谢谢大家（直接在命令行敲）
>> solve('x^2-2*x+1')
??? Error using ==> mupadinit at 35
Unable to initialize kernel

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

Error in ==> solve>getEqns at 171
[t,stat] = evalin(symengine,vc,'char');

Error in ==> solve at 84
[eqns,vars] = getEqns(varargin{:});