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I was restoring backups files after failed upgrade, trying to log in back to my site I got
Critical Error warning :
System.Data.SqlClient.SqlException: Error converting data type nvarchar to bit.
at DotNetNuke.Modules.Admin.Authentication.Login.OnInit(EventArgs e)
and
UserController.UserLogin()
If someone came across the same problem, please let me know how to resolve it.
Thank you