Mercedes MB Star C3 diagnostic Xentry 3.17 error (fixed)

Problem:

When open the MB Star C3 diagnostic system Xentry software, the system pops up Xentry 3.17 error.

Here is the solution by obd365.com technician:

Delete the lic_key_2.dat and lic_key_2x4712 files under LicDir folder.
 Follow the instruction to re-activate the star diagnostic DAS and Xentry software.
How to activate MB Star diagnostic DAS/Xentry

If still not working after activation, you need to send the MB star C3 multiplexer hardware back to repair.