Loader is disappearing before getting response from server.
It took time to delete admin user and throws following error on deletion:

ErrorID : 0
ErrorSource : ControllerAppTier.Delete->WORKTERRAControllerAppTier.Delete->AdminUser.Delete->AdminUser.DeleteAdminUser
ErrorMessage: Cannot get the data of the row from the OLE DB provider "SQLNCLI10" for linked server "MORELLOSR\MORELLOSR".
OLE DB provider "SQLNCLI10" for linked server "MORELLOSR\MORELLOSR" returned message "Row handle referred to a deleted row or a row marked for deletion.".
StackTrace: at WORKTERRA.Shared.WORKTERRAControllerAppTier.Delete(WORKTERRAControllerWebTierEntity objWORKTERRAControllerWebTierEntity)
at WORKTERRA.ControllerAppTier.Delete(Int32 intProjectsId, String strInput)
TargetSite: System.String Delete(WORKTERRA.Shared.WORKTERRAControllerWebTierEntity)

SP : OES_SP_DeleteAdminUser
Tables: Users, SystemUsers, CompanyAdminDataScreen, CompanySystemUser, SystemUsersAdministrativeTools