MatLab sscript server not reading passed variable

[jmaslek]

So I have my MatLab script server that passes something called tMax.  I have a function that gets called in my code that uses this.  When I run the VI, I get.  

LabVIEW:  Error occurred while executing script. Error message from server: ??? Undefined function or variable 'tMax'.

Error in evalFunctionLabVIEW>ExpRamp (line 19)
   y = (b - a*exp(tMax / tau) + (a-b)*exp(t/tau))/ ( 1 - exp(tMax / tau) );

Error in evalFunctionLabVIEW (line 3)
y = evalin('base',expression);

I can then go to the MatLab command window and type who, sure enough my tMax is defined.  I am hoping someone knows why this would be occuring

[Sekine108]

This is strange. Is this a new project? Has this ever been working in the past? Have you seen this function work anywhere is in your code? Or a different code base?