I also get the same error. I modified a plugin.xml file that seemed incorrect and now I have this one:
java.lang.ClassCastException: org.objectstyle.wolips.eomodeler.core.sql.EOFSQLGeneratorFactory cannot be cast to org.objectstyle.wolips.eomodeler.core.sql.IEOSQLGeneratorFactory
at org.objectstyle.wolips.eomodeler.core.sql.IEOSQLGeneratorFactory$Utility.sqlGeneratorFactory(IEOSQLGeneratorFactory.java:29)
at org.objectstyle.wolips.eomodeler.actions.GenerateSQLDialog.generateSql(GenerateSQLDialog.java:297)
at org.objectstyle.wolips.eomodeler.actions.GenerateSQLDialog$1.run(GenerateSQLDialog.java:279)
at java.lang.Thread.run(Thread.java:745)
I do not understand how it is possible; EOFSQLGeneratorFactory implements IEOSQLGeneratorFactory !
public class EOFSQLGeneratorFactory implements IEOSQLGeneratorFactory {
...
}