Cura 4.4. and 4.4.1 wont run

[Dog107 0]

I have just tried to update my Cura software from 4.4. to .4.4.1. After installing 4.4.1 it wouldn't open, so I reverted back to 4.4 and now that wont open. Can anyone help with this please?

 

ErrorTraceback

Traceback (most recent call last):
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\Machines\Models\IntentCategoryModel.py", line 101, in _update
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\Machines\Models\IntentModel.py", line 40, in __init__
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\Machines\Models\IntentModel.py", line 66, in _update
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\Machines\Models\IntentModel.py", line 105, in _getActiveMaterials
KeyError: 'ultimaker_pla_silver-metallic'

Log

Thread 0x00002b44 (most recent call first):
  File "C:\Program Files\Ultimaker Cura 4.4\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 0x00003320 (most recent call first):
  File "C:\Program Files\Ultimaker Cura 4.4\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 0x000033c0 (most recent call first):
  File "threading.py", line 297 in wait
  File "zeroconf.py", line 1569 in wait
  File "zeroconf.py", line 1153 in run
  File "threading.py", line 914 in _bootstrap_inner
  File "threading.py", line 882 in _bootstrap

Thread 0x00003310 (most recent call first):
  File "threading.py", line 297 in wait
  File "threading.py", line 549 in wait
  File "C:\Program Files\Ultimaker Cura 4.4\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 0x0000314c (most recent call first):
  File "threading.py", line 297 in wait
  File "zeroconf.py", line 1569 in wait
  File "zeroconf.py", line 1017 in run
  File "threading.py", line 914 in _bootstrap_inner
  File "threading.py", line 882 in _bootstrap

Thread 0x000033a0 (most recent call first):
  File "zeroconf.py", line 946 in run
  File "threading.py", line 914 in _bootstrap_inner
  File "threading.py", line 882 in _bootstrap

Thread 0x000018ec (most recent call first):
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\Backend\Backend.py", line 150 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 0x00002478 (most recent call first):
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\Backend\Backend.py", line 138 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 0x00002524 (most recent call first):
  File "threading.py", line 293 in wait
  File "threading.py", line 424 in acquire
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 86 in _nextJob
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 112 in run
  File "threading.py", line 914 in _bootstrap_inner
  File "threading.py", line 882 in _bootstrap

Thread 0x00002e94 (most recent call first):
  File "threading.py", line 293 in wait
  File "threading.py", line 424 in acquire
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 86 in _nextJob
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 112 in run
  File "threading.py", line 914 in _bootstrap_inner
  File "threading.py", line 882 in _bootstrap

Thread 0x000030fc (most recent call first):
  File "threading.py", line 293 in wait
  File "threading.py", line 424 in acquire
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 86 in _nextJob
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 112 in run
  File "threading.py", line 914 in _bootstrap_inner
  File "threading.py", line 882 in _bootstrap

Thread 0x000031c4 (most recent call first):
  File "threading.py", line 293 in wait
  File "threading.py", line 424 in acquire
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 86 in _nextJob
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\JobQueue.py", line 112 in run
  File "threading.py", line 914 in _bootstrap_inner
  File "threading.py", line 882 in _bootstrap

Current thread 0x000032b8 (most recent call first):
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\CrashHandler.py", line 306 in _logInfoWidget
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\CrashHandler.py", line 156 in _createDialog
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\CrashHandler.py", line 77 in __init__
  File "X:\4.4-exe\build\inst\bin\cura_app.py", line 111 in exceptHook
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\CrashHandler.py", line 391 in _show
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\Event.py", line 189 in call
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\Qt\QtApplication.py", line 428 in event
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\CuraApplication.py", line 1003 in event
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\CrashHandler.py", line 391 in _show
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\Event.py", line 189 in call
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\Qt\QtApplication.py", line 428 in event
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\CuraApplication.py", line 1003 in event
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\UM\Qt\QtApplication.py", line 341 in exec_
  File "X:\4.4-exe\build\inst\lib\python3.5\site-packages\cura\CuraApplication.py", line 804 in run
  File "X:\4.4-exe\build\inst\bin\cura_app.py", line 180 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