out of the blue my cura 7.1 started to give me the above error and i dont know why :
Thread 0x000002d8 (most recent call first):
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Backend\Backend.py", line 161 in _storeStderrToLogThread
File "threading.py", line 862 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x000005c8 (most recent call first):
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Backend\Backend.py", line 149 in _storeOutputToLogThread
File "threading.py", line 862 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x000017d4 (most recent call first):
File "C:\Program Files\Ultimaker Cura 4.6\plugins\RemovableDriveOutputDevice\RemovableDrivePlugin.py", line 61 in _updateThread
File "threading.py", line 862 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x00001ee8 (most recent call first):
File "C:\Program Files\Ultimaker Cura 4.6\plugins\USBPrinting\USBPrinterOutputDeviceManager.py", line 86 in _updateThread
File "threading.py", line 862 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x00003640 (most recent call first):
File "threading.py", line 297 in wait
File "zeroconf\__init__.py", line 2117 in wait
File "zeroconf\__init__.py", line 1434 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x00000674 (most recent call first):
File "threading.py", line 297 in wait
File "threading.py", line 549 in wait
File "C:\Program Files\Ultimaker Cura 4.6\plugins\UM3NetworkPrinting\src\Network\ZeroConfClient.py", line 74 in _handleOnServiceChangedRequests
File "threading.py", line 862 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x000026e4 (most recent call first):
File "threading.py", line 297 in wait
File "zeroconf\__init__.py", line 2117 in wait
File "zeroconf\__init__.py", line 1262 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x00001f58 (most recent call first):
File "zeroconf\__init__.py", line 1183 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x000013e4 (most recent call first):
File "threading.py", line 293 in wait
File "threading.py", line 424 in acquire
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 98 in _nextJob
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 123 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x00002b30 (most recent call first):
File "threading.py", line 293 in wait
File "threading.py", line 424 in acquire
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 98 in _nextJob
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 123 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x00001798 (most recent call first):
File "threading.py", line 293 in wait
File "threading.py", line 424 in acquire
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 98 in _nextJob
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 123 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Thread 0x000030e8 (most recent call first):
File "threading.py", line 293 in wait
File "threading.py", line 424 in acquire
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 98 in _nextJob
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 123 in run
File "threading.py", line 914 in _bootstrap_inner
File "threading.py", line 882 in _bootstrap
Current thread 0x00002728 (most recent call first):
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\CrashHandler.py", line 379 in _logInfoWidget
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\CrashHandler.py", line 180 in _createDialog
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\CrashHandler.py", line 86 in __init__
File "C:\cura-build-output\build\inst\bin\cura_app.py", line 166 in exceptHook
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Math\Polygon.py", line 224 in getConvexHull
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\Scene\ConvexHullDecorator.py", line 292 in _compute2DConvexHull
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\Scene\ConvexHullDecorator.py", line 109 in getConvexHull
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\Scene\ConvexHullDecorator.py", line 168 in getPrintingArea
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Scene\SceneNode.py", line 289 in callDecoration
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\Scene\CuraSceneNode.py", line 91 in collidesWithAreas
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\BuildVolume.py", line 263 in updateNodeBoundaryCheck
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\PlatformPhysics.py", line 56 in _onChangeTimerFinished
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\PlatformPhysics.py", line 194 in _onToolOperationStopped
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Signal.py", line 332 in __performEmit
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Signal.py", line 219 in emit
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Controller.py", line 297 in _onToolOperationStopped
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Signal.py", line 332 in __performEmit
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Signal.py", line 219 in emit
File "C:\Program Files\Ultimaker Cura 4.6\plugins\Tools\TranslateTool\TranslateTool.py", line 361 in event
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Controller.py", line 397 in event
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Signal.py", line 332 in __performEmit
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Signal.py", line 219 in emit
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Qt\QtMouseDevice.py", line 37 in handleEvent
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Qt\Bindings\MainWindow.py", line 190 in mouseReleaseEvent
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\UM\Qt\QtApplication.py", line 378 in exec_
File "C:\cura-build-output\build\inst\lib\python3.5\site-packages\cura\CuraApplication.py", line 813 in run
File "C:\cura-build-output\build\inst\bin\cura_app.py", line 234 in <module>
File "Console.py", line 24 in <module>
File "<frozen importlib._bootstrap>", line 634 in _load_backward_compatible
File "<frozen importlib._bootstrap>", line 664 in _load_unlocked
File "<frozen importlib._bootstrap>", line 957 in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 968 in _find_and_load
File "__startup__.py", line 12 in <module>
File "<frozen importlib._bootstrap>", line 634 in _load_backward_compatible
File "<frozen importlib._bootstrap>", line 664 in _load_unlocked
File "<frozen importlib._bootstrap>", line 957 in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 968 in _find_and_load
AttributeError: 'NoneType' object has no attribute 'close'
this is the log