MATLAB: Error in Constraining Symbolic Variables

MATLABSymbolic Math Toolboxsyms

I'm having trouble constraining a symbolic variable to a specific set of numbers.
Example:
(input)
>> syms k positive
will result in (output)
??? Error using ==> mupadinit at 35
    Unable to initialize kernel
Error in ==> mupadengine.mupadengine>mupadengine.evalin at 117
                    [res,status] = mupadmex(statement,8);
Error in ==> mupadeval at 18
            result = evalin(symengine,statement,'char');
Error in ==> sym.sym>sym.sym/assumptions at 619
                            mupadeval(['assume(' s ' > 0):']);
Error in ==> sym.sym>sym.sym/symchar at 203
                            assumptions(x,a);  
Error in ==> sym.sym>sym.sym at 120
                    S = cell2sym(S,symchar(x,a,nargin));
I have also tried entering this as k=sym('k','positive') to the same effect. I don't understand why this is happening. Also, inputting the command "clear all" has the following effect.
>> clear all
Warning: The following error was caught while executing 'mupadengine' class destructor:
Error using ==> mupadinit at 35
Unable to initialize kernel
I am worried the code may be corrupted for some reason. If someone could provide insight into my issue or help me correct it, I would be greatly appreciative.

Best Answer

I would recommend re-installing the symbolic toolbox.
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