Hi!

I installed module builder: drush dl module_builder

mb version = "7.x-2.x-dev" (in ./drush/module_builder/module_builder.info)

I generate .info and .module file for a 6.x drupal.
All works, but
after all command I get:

Problem reading json file. [error]

I found this error message here:
./includes/process.inc: drupal_set_message(t('Problem reading json file.'), 'error');

Idea?