Error when using BEASTGen

[Yasmin Asar]

Hi all, 

I am attempting to extract data from XML files (morphological characters as well as sequence data). However, whenever I try to use BEASTGen to do so, I run into the following error:

"Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

   at java.util.ArrayList.rangeCheck(ArrayList.java:659)

   at java.util.ArrayList.get(ArrayList.java:435)

   at dr.app.beastgen.DataModelImporter.importBEASTFile(Unknown Source)

   at dr.app.beastgen.DataModelImporter.importFromFile(Unknown Source)

   at dr.app.beastgen.BEASTGen.constructDataModel(Unknown Source)

   at dr.app.beastgen.BEASTGen.<init>(Unknown Source)

   at dr.app.beastgen.BEASTGen.main(Unknown Source)"

Anyone have any idea what might be going wrong?

Thanks,

Yasmin