Error 555 means that your Smaart license was disabled due to the detection of a "sandbox" program. Please disable any sandboxing software that is active on your machine and try launching Smaart again.
Link to Wikipedia article on "sandbox" programs: https://en.wikipedia.org/wiki/Sandbox_%28computer_security%29
If you still are having issues, please submit a support ticket.
To Contact Rational Acoustics Support:
Submit a Ticket Here or Email us at Support@RationalAcoustics.com.