yes i have the answer but i don't understand reason . what is changed in the object ??????
2018-07-11 18:14:48,582 - INFO - [MainThread] cura.Machines.MachineErrorChecker._setResult [181]: Error check finished, result = False, time = 2.9s
2018-07-11 18:14:49,082 - DEBUG - [MainThread] CuraEngineBackend.CuraEngineBackend.slice [210]: Starting to slice...
2018-07-11 18:14:49,082 - DEBUG - [MainThread] CuraEngineBackend.CuraEngineBackend.slice [227]: Going to slice build plate [0]!
2018-07-11 18:14:49,082 - DEBUG - [MainThread] CuraEngineBackend.CuraEngineBackend.slice [235]: Build plate 0 has no objects to be sliced, skipping
2018-07-11 18:14:52,540 - DEBUG - [Thread-7] USBPrinting.AutoDetectBaudJob.run [37]: Checking COM11 if baud rate 250000 works
2018-07-11 18:14:54,062 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [277]: file:///C:/Program Files/Ultimaker Cura 3.3/resources/qml/SidebarHeader.qml:20: TypeError: Cannot read property 'length' of undefined
2018-07-11 18:14:54,417 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [66]: An uncaught error has occurred!
2018-07-11 18:14:54,419 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]: Traceback (most recent call last):
2018-07-11 18:14:54,420 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]: File "X:\3.3\build\inst\lib\python3.5\site-packages\UM\Qt\Bindings\ExtensionModel.py", line 51, in subMenuTriggered
2018-07-11 18:14:54,421 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]: File "X:\3.3\build\inst\lib\python3.5\site-packages\UM\Extension.py", line 38, in activateMenuItem
2018-07-11 18:14:54,422 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]: File "C:\Program Files\Ultimaker Cura 3.3\plugins\BedlevelPlugin\BedLevelMachineAction.py", line 133, in startBedLeveling
2018-07-11 18:14:54,423 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]: printer_output_devices[0].moveHead(0, 0, 10)
2018-07-11 18:14:54,425 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [69]: AttributeError: 'USBPrinterOutputDevice' object has no attribute 'moveHead'
2018-07-11 18:15:07,514 - DEBUG - [MainThread] UM.PluginRegistry._savePluginData [122]: Saving plugin data to file 'C:\Users\tommy\AppData\Roaming\cura\3.3\plugins.json'
2018-07-11 18:15:07,514 - INFO - [MainThread] UM.PluginRegistry.loadPlugin [404]: Loaded plugin FileLogger
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ahoeben 2,026
Check the logs. They should tell you what went wrong.
Cura changes from version to version. That means you can't always use the same code in plugins between versions. Such is life.
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