Strange NullReferenceException error with weird paths

Unity Engine
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1

I have this error in my 2D game when I start play mode.

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Graphs.Edge.WakeUp () (at /Users/bokken/build/output/unity/unity/Editor/Graphs/UnityEditor.Graphs/Edge.cs:114)
UnityEditor.Graphs.Graph.DoWakeUpEdges (System.Collections.Generic.List1[T] inEdges, System.Collections.Generic.List1[T] ok, System.Collections.Generic.List`1[T] error, System.Boolean inEdgesUsedToBeValid) (at /Users/bokken/build/output/unity/unity/Editor/Graphs/UnityEditor.Graphs/Graph.cs:387)
UnityEditor.Graphs.Graph.WakeUpEdges (System.Boolean clearSlotEdges) (at /Users/bokken/build/output/unity/unity/Editor/Graphs/UnityEditor.Graphs/Graph.cs:286)
UnityEditor.Graphs.Graph.WakeUp (System.Boolean force) (at /Users/bokken/build/output/unity/unity/Editor/Graphs/UnityEditor.Graphs/Graph.cs:272)
UnityEditor.Graphs.Graph.WakeUp () (at /Users/bokken/build/output/unity/unity/Editor/Graphs/UnityEditor.Graphs/Graph.cs:250)
UnityEditor.Graphs.Graph.OnEnable () (at /Users/bokken/build/output/unity/unity/Editor/Graphs/UnityEditor.Graphs/Graph.cs:245)

Everything still works fine but like why are the paths in the error not in my game?

2

Try to install another version of Unity from here.

However, some users say that you just need to restart Unity.