Illegal attribute 'Abstract' error

If you are getting the "Illegal attribute 'Abstract'" error, it is likely that you are using a Matlab version before 2012A. You can try to circumvent this error by doing the following:

1) Open the IEEGObject.m file
2) Remove "(Abstract)" from the first line of the file: classdef (Abstract) IEEGObject < handle
3) Save the file, restart Matlab.

This should fix the problem and not cause any change in behavior of the toolbox.