Liquibase IDE error

I downloaded the IDE from sourceforge website and followed the demo on the website to create a new table, I got following error when I hit 'finish" button on the “Change Set Information” :

Error Creating Change: null

I was able to connect to my Informix database (V11.10), and manually created databasechangelog tables. And I also created an empty changelog.xml file in \TMP directory.  Please help !

Unfortunately the IDE project has been not kept up to date and is no longer supported.  Hopefully I (or someone else) is able to pick it back up in the future.  As it is, it is based on a very old version of liquibase that has known bugs.