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Unity 2018.3.0f2 (64-bit) Missing UpmOperationFactory, Unity 2018.3.0f2 (64-bit) version UpmOperationFactory missing

A few weeks ago i tried to test a new file i created. When i clicked play, i received the error message below. I have tried uninstalling both Unity and Microsoft visual studio and then reinstalled but i kept receiving the error. I then tried to delete every file related to Unity and uninstall but i still received the error. I am unable to test any scene including one i create now. Library\PackageCache\com.unity.package-manager-ui@2.0.3\Editor\Sources\Services\OperationFactory.cs(11,37): error CS0246: The type or namespace name 'UpmOperationFactory' could not be found (are you missing a using directive or an assembly reference?),A few weeks ago i tried to test a new file i created and i received the error below. I tried uninstalling unity and reinstalling but got the same error. I also tried deleting every Unity file (including Microsoft visual studio 2017) and reinstalling but i still received the error. Library\PackageCache\com.unity.package-manager-ui@2.0.3\Editor\Sources\Services\OperationFactory.cs(11,37): error CS0246: The type or namespace name 'UpmOperationFactory' could not be found (are you missing a using directive or an assembly reference?)

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