Please help me to solve the license code error below..

Altair License Manager: License error
Feature(s): GlobalZoneAM, HyperWorks, HWHyperView
Error Code: 15
Error Description:
[NETWORK] 7790@hpcflexlm1.asc.edu - (Err: 15) Unable to connect to license server
[NETWORK] 7790@hpcflexlm2.asc.edu - (Err: 15) Unable to connect to license server
[NETWORK] 7790@hpcflexlm3.asc.edu - (Err: 15) Unable to connect to license server
Feature: HyperView
Error Code: 15
Error Description:
[LOCAL] C:/Program Files/Altair/2017/security/altair_lic.dat - (Err: 6) Unable to read file
[NETWORK] 7790@hpcflexlm1.asc.edu - (Err: 15) Unable to connect to license server
[NETWORK] 7790@hpcflexlm3.asc.edu - (Err: 15) Unable to connect to license server
[NETWORK] 7790@hpcflexlm2.asc.edu - (Err: 15) Unable to connect to license server
License Path: C:/Program Files/Altair/2017/security/altair_lic.dat;7790@hpcflexlm1.asc.edu;7790@hpcflexlm2.asc.edu;7790@hpcflexlm3.asc.edu