diff --git a/plugins/USBPrinting/USBPrinterOutputDevice.py b/plugins/USBPrinting/USBPrinterOutputDevice.py
index da3dfa2bde..6b5fe22fcf 100644
--- a/plugins/USBPrinting/USBPrinterOutputDevice.py
+++ b/plugins/USBPrinting/USBPrinterOutputDevice.py
@@ -8,14 +8,12 @@ import time
 import queue
 import re
 import functools
-import os.path
 
 from UM.Application import Application
 from UM.Logger import Logger
-from UM.PluginRegistry import PluginRegistry
 from cura.PrinterOutputDevice import PrinterOutputDevice, ConnectionState
+from UM.Message import Message
 
-from PyQt5.QtQml import QQmlComponent, QQmlContext
 from PyQt5.QtCore import QUrl, pyqtSlot, pyqtSignal
 
 from UM.i18n import i18nCatalog
@@ -137,7 +135,7 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
     #   \param gcode_list List with gcode (strings).
     def printGCode(self, gcode_list):
         if self._progress or self._connection_state != ConnectionState.connected:
-            self._error_message = Message(i18n_catalog.i18nc("@info:status", "Printer is busy or not connected. Unable to start a new job."))
+            self._error_message = Message(catalog.i18nc("@info:status", "Printer is busy or not connected. Unable to start a new job."))
             self._error_message.show()
             Logger.log("d", "Printer is busy or not connected, aborting print")
             self.writeError.emit(self)