Scientific calculator GUI error message

I am building a scientific calculator GUI for a class project. The only number that works without error is "6" which happens to be my pushbutton 1. I can perform all my calculations as long as they are multiples of 6.... Whenever I press a numeric button other than 6 I get the following error message. Undefined function or variable 'textString'. All the other numbers are the same in the .m file

[Walter Roberson]

Duplicated by http://uk.mathworks.com/matlabcentral/answers/249575-trying-to-make-a-scientific-calculator-gui-and-get-this-type-of-error-message-for-all-numbers-but-6

Answer 1

[Walter Roberson]

The error is on 58.

[Bob Riggin]

I don't understand what you mean? "% Update handles structure"?

[Walter Roberson]

And the way I had to know that line 58 was a comment was... ?