You need to add that line in org.drools.rule.DialectRuntimeRegistry and org.drools.base.mvel.MVELCompilationUnit which are drools core classes. Then you need to recompile Guvnor and Drools again. I suggest you to use the latest sources to check if the error was solved.<div>

<br></div><div>Best,<div><br>XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX<br><br>Esteban Aliverti<br></div></div>