I'm not sure where that text would be coming from within the SCLogin module. However, it's only a PHP warning message. Those are not real errors, but something for developers to be aware of. In the Joomla -> Global Configuration area, you can set the Error Reporting option to 'None', which should hide that message. Then, make sure that any translations for SCLogin or CB in general are correct.
I hope that helps, but should you need anything else, please let me know.
Thanks,
Alex