In a ContainerIconTree create a hierarchy which looks like the following:

 Object
   |
   |___ Object1
   |      |
   |      |____ Object2
   |
   |
   |___ Object1
          |
          |____ Object2

 With all of the above exanded, select the 2nd Object1 and  delete it.
 You get the walkback Error string: (ExCLDTIndexOutOfRange) Index out of range.


To install the fix:

1) From the File pulldown, choose Open and open the .st file that
   came with this readme.
2) Select all the text and file in.