Solidworks 2015 cannot find the license. It was working fine then stopped working. Errors given are

(lmgrd) Starting vendor daemons ...

13:56:02 (lmgrd) License server manager (lmgrd) startup failed:

13:56:02 (lmgrd) File not found, SW_D.exe

License server status: 25734@anselm
    License file(s) on anselm: C:\Program Files (x86)\SolidWorks License Manager\sw_d.lic:

lmgrd is not running: License server machine is down or not responding.
See the system administrator about starting the license server system, or
make sure you're referring to the right host (see LM_LICENSE_FILE).
Hostname:      10.0.0.149
License path:  25734@anselm;
FlexNet Licensing error:-96,491
For further information, refer to the FlexNet Licensing documentation,
available at "www.flexerasoftware.com".

In lmtools utility it is reading the license file.

any help is appreciated.