One of the known issues listed by Microsoft for the recently released Windows 10 Insider Preview Build 11102 is WSClient.dll error dialog which the user gets to see after logging in. Microsoft is working on the fix. While the Microsoft is working on a fix, it has posted a workaround also for the same.

Actually users are getting this error in the previous build 11099 also.

Just run the following at the Command Prompt with admin rights.
schtasks /delete /TN “\Microsoft\Windows\WS\WSRefreshBannedAppsListTask ” /F

So if you are facing this issue, try the workaround till Microsoft issues the fix.