E [14/Oct/2017:08:19:21 +0100] [Client 12] Returning IPP client-error-bad-request for CUPS-Add-Modify-Printer (ipp://localhost:631/printers/Deskjet-2540-series) from localhost
E [14/Oct/2017:08:19:21 +0100] [Client 18] Returning IPP client-error-bad-request for CUPS-Add-Modify-Printer (ipp://localhost:631/printers/Deskjet-2540-series) from localhost
E [14/Oct/2017:08:28:38 +0100] [Client 28] Returning IPP client-error-bad-request for CUPS-Add-Modify-Printer (ipp://localhost:631/printers/Deskjet-2540-series) from localhost
E [14/Oct/2017:08:28:38 +0100] [Client 37] Returning IPP client-error-bad-request for CUPS-Add-Modify-Printer (ipp://localhost:631/printers/Deskjet-2540-series) from localhost
E [14/Oct/2017:09:13:15 +0100] [Client 49] Returning IPP client-error-bad-request for CUPS-Add-Modify-Printer (ipp://localhost:631/printers/Deskjet-2540-series) from localhost
E [14/Oct/2017:09:13:15 +0100] [Client 57] Returning IPP client-error-bad-request for CUPS-Add-Modify-Printer (ipp://localhost:631/printers/Deskjet-2540-series) from localhost
E [14/Oct/2017:09:22:18 +0100] [Client 66] Returning IPP client-error-bad-request for CUPS-Add-Modify-Printer (ipp://localhost:631/printers/Deskjet_2540) from localhost
E [14/Oct/2017:09:34:00 +0100] [Client 91] Returning IPP client-error-bad-request for CUPS-Add-Modify-Printer (ipp://localhost:631/printers/HP-Deskjet-2540-series) from localhost