It happened to me. But then I closed my outlook.
Close the payslip report. Create again and when clicked the email button— untick the Select none button then tick it again.
Clicken send email... ans it works.
After all sent, open the outlook and in sent email folder all payslips were listed there successfully.
Success! Payslips are now sent. Thanks for that. HOWEVER, now I can't open Outlook. I keep getting a 'Sorry we're having trouble starting Outlook ....' error message. Does anyone know what is causing this conflict? Because if I have to restart my computer every time I process wages will get very painful.