1. What happened
Selecting a clip/take after selecting the edit the clip name, systematically gives this error:
"InvalidOperationException: Operation is not valid due to the current state of the object"

2. How we can reproduce it using the example you attached
Open attached project or any FBX file with humanoid animation.
Select FBX file in Project window
In the Inspector, select the clip name "editable field" (no need to change the name, as long as existing text gets selected)
Now, click any other clip/take in the list...
Error: "InvalidOperationException: Operation is not valid due to the current state of the object"