impressora fiscal bematech 2100 não fecha o cupom

 stoq
17:55:57 stoq.gui.shell.bootstrap Traceback (most recent call last):
17:55:57 stoq.gui.shell.bootstrap   File "/usr/lib/python2.7/dist-packages/stoq/gui/pos.py", line 1271, in on_barcode__activate
17:55:57 stoq.gui.shell.bootstrap     self._checkout_or_add_item()
17:55:57 stoq.gui.shell.bootstrap   File "/usr/lib/python2.7/dist-packages/stoq/gui/pos.py", line 1026, in _checkout_or_add_item
17:55:57 stoq.gui.shell.bootstrap     self.checkout()
17:55:57 stoq.gui.shell.bootstrap   File "/usr/lib/python2.7/dist-packages/stoq/gui/pos.py", line 987, in checkout
17:55:57 stoq.gui.shell.bootstrap     subtotal=self._get_subtotal())
17:55:57 stoq.gui.shell.bootstrap   File "/usr/lib/python2.7/dist-packages/stoqlib/gui/fiscalprinter.py", line 506, in confirm
17:55:57 stoq.gui.shell.bootstrap     if not self.setup_payments(sale):
17:55:57 stoq.gui.shell.bootstrap   File "/usr/lib/python2.7/dist-packages/stoqlib/gui/fiscalprinter.py", line 669, in setup_payments
17:55:57 stoq.gui.shell.bootstrap     self.emit('add-payments', sale)
17:55:57 stoq.gui.shell.bootstrap   File "/usr/lib/python2.7/dist-packages/stoqlib/gui/fiscalprinter.py", line 386, in emit
17:55:57 stoq.gui.shell.bootstrap     raise sys.last_value  # pylint: disable=E0702
17:55:57 stoq.gui.shell.bootstrap NotOneError: one() used with more than one result available
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/stoq/gui/pos.py", line 1271, in on_barcode__activate
    self._checkout_or_add_item()
  File "/usr/lib/python2.7/dist-packages/stoq/gui/pos.py", line 1026, in _checkout_or_add_item
    self.checkout()
  File "/usr/lib/python2.7/dist-packages/stoq/gui/pos.py", line 987, in checkout
    subtotal=self._get_subtotal())
  File "/usr/lib/python2.7/dist-packages/stoqlib/gui/fiscalprinter.py", line 506, in confirm
    if not self.setup_payments(sale):
  File "/usr/lib/python2.7/dist-packages/stoqlib/gui/fiscalprinter.py", line 669, in setup_payments
    self.emit('add-payments', sale)
  File "/usr/lib/python2.7/dist-packages/stoqlib/gui/fiscalprinter.py", line 386, in emit
    raise sys.last_value  # pylint: disable=E0702
NotOneError: one() used with more than one result available