Hello, I have a weird issue with animation player. I tried to key in some frames from a new sprite resource on my animation player but now I run into this weird error:

Cannot get path of node as it is not in a scene tree
(Node not found: "Guard:frame" (relative to "").)
On Animation: "RESET", couldn't resolve track: 'Guard:frame'.

This error shows for a split second and then goes away, and my sprite starts to animate normally without any obvious issues.
Does the program eventually find the proper path? How can I get the animation player to recognize the sprite location (which is in the hierarchy of my player node) and stop showing this error?

For reference, all other sprites in this hierarchy except "Guard" sprite work properly and don't show this error.

After looking at this more in the editor, the output window shows this after I keyed a frame.

Anyone have an ideas? I'm really stuck and would appreciate the help. Thank you.