Hello,
I've found this question by specifically searching for you. Unfortunatelly Mathworks doesn't notify users based on key words (or I'm not able to set it so).
This error doesn't seem to be related to the matlab toolbox itself, but rather to the EnergyPlus. Have you tried looking into the .err file? It will be located at a working folder under /eplusout/ folder. This is an energy plus generated file which might give you some insight.
If the example files work, then the toolbox should work. If that is not the case, I'll do my best to correct any mistakes.
Jiri
