The error comes due to SignIn tool not able to found the certificate or the certificate expired. To See if the certificate is expired or not, open project properties and go to Signing in Left menu. See below:
I) Create a new certificate and select from file.
II) Create a new wpf project and copy the certificate from the root project folder and paste in the current project and rename it.
Posted On: 15-Sep-2018 21:59