The latest version for the hr_payroll_community module is 13.0.1.5.3, make sure you have the upgrade your module and give it a try?

this is the error :
File "C:\Program Files (x86)\Odoo 13.0\server\odoo\addons\hr_payroll_account_community\wizard\hr_payroll_payslips_by_employees.py", line 12, in compute_sheet return super(HrPayslipEmployees, self.with_context(journal_id=journal_id)).compute_sheet() File "C:\Program Files (x86)\Odoo 13.0\server\odoo\addons\hr_payroll_community\wizard\hr_payroll_payslips_by_employees.py", line 40, in compute_sheet payslips.compute_sheet() ** File "C:\Program Files (x86)\Odoo 13.0\server\odoo\addons\dev_hr_loan\models\hr_payslip.py", line 24, in compute_sheet [('employee_id', '=', self.employee_id.id), ('loan_id.state', '=', 'done'), ('is_paid', '=', False),('date','<=',self.date_to)]) File "C:\Program Files (x86)\Odoo 13.0\server\odoo\fields.py", line 3681, in get raise ValueError("Expected singleton: %s" % record) ValueError: Expected singleton: hr.employee(2357, 2432)**

the code of loand it this :
----------------------------loan code ----------------------------------
class hr_payslip(models.Model):
_inherit = 'hr.payslip'

installment_ids = fields.Many2many('installment.line',string='Installment Lines')
installment_amount = fields.Float('Installment Amount',compute='get_installment_amount')
installment_int = fields.Float('Installment Amount',compute='get_installment_amount')

def compute_sheet(self):

installment_ids = self.env['installment.line'].search(
[('employee_id', '=', self.employee_id.id), ('loan_id.state', '=', 'done'), ('is_paid', '=', False),('date','<=',self.date_to)])
if installment_ids:
self.installment_ids = [(6, 0, installment_ids.ids)]
return super(hr_payslip,self).compute_sheet()

---------------------code hr_payroll_ payslip_employee --------------------------
# -*- coding: utf-8 -*-

from odoo import api, fields, models, _
from odoo.exceptions import UserError

class HrPayslipEmployees(models.TransientModel):
_name = 'hr.payslip.employees'
_description = 'Generate payslips for all selected employees'

employee_ids = fields.Many2many('hr.employee', 'hr_employee_group_rel', 'payslip_id', 'employee_id', 'Employees')

def compute_sheet(self):
payslips = self.env['hr.payslip']
[data] = self.read()
active_id = self.env.context.get('active_id')
if active_id:
[run_data] = self.env['hr.payslip.run'].browse(active_id).read(['date_start', 'date_end', 'credit_note'])
from_date = run_data.get('date_start')
to_date = run_data.get('date_end')
if not data['employee_ids']:
raise UserError(_("You must select employee(s) to generate payslip(s)."))
for employee in self.env['hr.employee'].browse(data['employee_ids']):
slip_data = self.env['hr.payslip'].onchange_employee_id(from_date, to_date, employee.id, contract_id=False)
res = {
'employee_id': employee.id,
'name': slip_data['value'].get('name'),
'struct_id': slip_data['value'].get('struct_id'),
'contract_id': slip_data['value'].get('contract_id'),
'payslip_run_id': active_id,
'input_line_ids': [(0, 0, x) for x in slip_data['value'].get('input_line_ids')],
'worked_days_line_ids': [(0, 0, x) for x in slip_data['value'].get('worked_days_line_ids')],
'date_from': from_date,
'date_to': to_date,
'credit_note': run_data.get('credit_note'),
'company_id': employee.company_id.id,
}
payslips += self.env['hr.payslip'].create(res)
payslips.compute_sheet()
return {'type': 'ir.actions.act_window_close'}