1.Browse to ‘C:\ProgramData\FLEXnet’
2.Delete all files that start with 'SW_D'.
3.Open the SOLIDWORKS application and try and reproduce the error.
If you see the error again, continue with the next steps:
4.Open a Windows® command prompt as administrator.
5.Run the command:
[SOLIDWORKS installation location\SOLIDWORKS\setup\i386\swactwiz.exe /ts:view
6.The command returns the ‘Fulfillment ID’. For example:
•SWX-26 for SOLIDWORKS 2018
•SWX-25 for SOLIDWORKS 2017
7.To delete the Fulfillment ID, run the command:
[SOLIDWORKS installation location]\SOLIDWORKS\setup\i386>swactwiz.exe /ts:delete /fulfillmentid:SWX-26