Odoo Server Error

Traceback (most recent call last):
  File "/home/odoo/src/odoo/14.0/odoo/tools/cache.py", line 85, in lookup
    r = d[key]
  File "/home/odoo/src/odoo/14.0/odoo/tools/func.py", line 71, in wrapper
    return func(self, *args, **kwargs)
  File "/home/odoo/src/odoo/14.0/odoo/tools/lru.py", line 34, in __getitem__
    a = self.d[obj]
KeyError: ('ir.model.data', , 'account.account_invoices_without_payment')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/odoo/src/odoo/14.0/addons/web/controllers/main.py", line 2121, in report_download
    response = self.report_routes(reportname, docids=docids, converter=converter, context=context)
  File "/home/odoo/src/odoo/14.0/odoo/http.py", line 532, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo/src/odoo/14.0/addons/web/controllers/main.py", line 2056, in report_routes
    pdf = report.with_context(context)._render_qweb_pdf(docids, data=data)[0]
  File "/home/odoo/src/odoo/14.0/addons/account/models/ir_actions_report.py", line 41, in _render_qweb_pdf
    invoice_reports = (self.env.ref('account.account_invoices_without_payment'), self.env.ref('account.account_invoices'))
  File "/home/odoo/src/odoo/14.0/odoo/api.py", line 511, in ref
    return self['ir.model.data'].xmlid_to_object(xml_id, raise_if_not_found=raise_if_not_found)
  File "/home/odoo/src/odoo/14.0/odoo/addons/base/models/ir_model.py", line 1944, in xmlid_to_object
    t = self.xmlid_to_res_model_res_id(xmlid, raise_if_not_found)
  File "/home/odoo/src/odoo/14.0/odoo/addons/base/models/ir_model.py", line 1928, in xmlid_to_res_model_res_id
    return self.xmlid_lookup(xmlid)[1:3]
  File "", line 2, in xmlid_lookup
  File "/home/odoo/src/odoo/14.0/odoo/tools/cache.py", line 90, in lookup
    value = d[key] = self.method(*args, **kwargs)
  File "/home/odoo/src/odoo/14.0/odoo/addons/base/models/ir_model.py", line 1921, in xmlid_lookup
    raise ValueError('External ID not found in the system: %s' % xmlid)
ValueError: External ID not found in the system: account.account_invoices_without_payment

The error occurs when I tried to print an invoice. It happens even if I choose an empty print template. Any help?

Thanks.