Allegro open tips for missing SfsBase.dll solutions

Problem:
The one-month cadence, when opening Allegro, suddenly made an error: Allegro was unable to start the program because SfsBase.dll was lost in the computer.
Attempting to open the schematic also prompts for errors, prompting for the loss of another file Cdn_sfl401as.dll.

Workaround:
1, QQ Group for help, most of the request to re-install cadence.
I feel more strange, in the installation directory of Cadence search SfsBase.dll file found not lost.
2, on-line search, said is the system environment variable problem. First, add the following path to the path of the system variable :

%cdsroot%/tools/pcb/bin;%cdsroot%/tools/capture;%cdsroot%/tools/bin;%cdsroot%/tools/jre/bin;%cdsroot%/tools/ Fet/bin;%cdsroot%/tools/specctra/bin;%cdsroot%/tools/libutil/bin;

When adding, remember to add a ";" at the end of the original path, so that the original path setting is not changed.

Reset the license file using the license servers configuration unilily.
User variable cds_lic_file is reset using the license client configuration unility.
Re-stop/start the server using LM tools.
Open Allegro again, or report the same error.
3, the user variable has already had the cdsroot variable, did not change the user variable, adds the Cdsroot variable in the system variable, sets the path which the Cadence installs, for me is d:\Cadence\SPB_16.6;
Add two times after point OK, re-open Allegro and capture, perfectly normal.

Problem solving.