ok; that's my silliness; because i didn't see that hibernate has it's own code generation management. what i'm trying to do is directly trying to run console config. under "Run" menu. but there can be a more descriptive error log for this like "Please run through / use Hibernate Code Generation Configurations" window.
You should not even see hibernate console configuration in the Run section!
Which version is this ? You are better of reporting this in jira with enough details so we can fix if it is in some latest release.