do all of the directories above the desired location of the output file exist?
belated update of source code to match the GAME...
fixed error by adding import uk.ac.roslin.ensembl.datasourceaware.core.DACoreObject;...
I am not used to maven so this could be me... I used svn to checkout: svn://svn.code.sf.net/p/jensembl/code/tags/jensembl-project-1.75...
I had the same problem -- I still got the warning 'Under WebStart on Java >= 1.6.0_18,...