Hi Bookie2
Thanks for the update.
As per checking, that message does indicate that the default payslip form i.e. Payroll_PaySlipSummary can't be found or the user doesn't have access to it for some reason.
Firstly, if you do have user restrictions in place i.e. they are not the administrator user with administrator role rights I would recommend ensuring that you do try with that administrator user.
If you are still encountering that message ideally the default form for printing/emailing can be selected in the Advance Filters > Selected form for pay slip. If that Payroll_PaySlipSummary form (or another form) can't be selected does the form appear in the Setup > Customise Forms > Pay Slip window? If so, are you able to select it and select Customise.
Please let me know how it goes.
If my response has answered your enquiry please click "Accept as Solution" to assist other users find this information.
Best regards,
Doreen