DotNetNuke Upgrade failed - The type initializer for 'DotNetNuke.Security.Membership.Data.DataProvider' threw an exception

Delete the following files from the \bin folder:

DotNetNuke.Authentication.ADSI.dll
DotNetNuke.Authentication.ADSIProvider.dll
DotNetNuke.DNNScheduler.SqlDataProvider.dll
DotNetNuke.HttpModules.Authentication.dll
DotNetNuke.Provider.DBLoggingProvider.SqlDataProvider.dll
DotNetNuke.Provider.Membership.SqlDataProvider.dll
DotNetNuke.Provider.SQLMembershipProvider.dll
DotNetNuke.Provider.SQLProfileProvider.dll
DotNetNuke.Provider.SQLRoleProvider.dll