Couldn't create 'C:!my\gamedev\unity-projects\testing-package-template\Packages\com.company-name.package-name/~UnityDirMonSyncFile~44d261d1b2c0f344499aeafe0c15a0ca~'
ArgumentNullException: Value cannot be null.
Parameter name: _unity_self
UnityEditor.UIElements.PropertyField.<CreatePropertyIMGUIContainer>b__43_0 ()
// etc...
first is yellow warning, second is red exception