Hi,
This is a shipped example, you can easily run the example using MATLAB Online or by the following command:
openExample('fininst/Demo_DieboldLi')
The error you mentioned sayns DieboldLi is undefined. I suspect this particular object is cleared accidentally from your worspace during execution. If the issue still persists, make use of breakpoints to solve your issue.
Hope I am able to point in the right direction!