License error: -38

Hello,

Whenever I try to run COMSOL 4.3, I get this error :

License error: -38
User/host on EXCLUDE list for product
User/host on EXCLUDE list for feature
Feature: CADIMPORT
license path: C;\Program Files\COMSOL43/licens/license.dat:
FLEXnet Licensing error:-38,147

Does anyone have an idea what i should do?

Thank you in advance for your help.