I’m getting an error message "Quaternion To Matrix conversion failed because input Quaternion is invalid{ number, number, numbe} != number UnityEngine.GUIUtility:ProcessEven(int, intptr,bool&) when I"m not running the game but when I was trying to add more frames to the timeline.
I’m not sure what is causing it.
Hi,
I don’t know what you did exactly but if the error popped up after you tried to add more frames to the timeline, check the korresponding keyframes in the animation. Maybe there are ‘funny’ values in the transform.rotation property.
You might also want to restart Unity because there are sometimes internal problems which solve themselves.
I tried to review the keyframes but didn’t notice anything.
Restarting Unity seems to have removed the issues.
Thank you Nina.
Fantastic! 
Next time, when you get an error which does not make much sense, try to restart first because that often fixes problem.
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