Can't find any keyframes

I’m moving my camera toward the front.
I accidentally moved a keyframe, and I’d like to adjust it, but now I can’t find any of my keyframes.
Suddenly all the keyframes are not shown in both timeline and dope sheet.
Does this happen often? How can I see my keyframes again?

This is the blend file.

Thank you.

Wow :thinking:

I’ve never seen such a broken file.
Indeed your bottom window doesn’t show anything in timeline or dopesheet, but opening timeline or dopesheet in any other windows works fine for me

See you :slight_smile: ++

You were right. This is certainly bizarre error, but when I open Timeline of Dopesheet in any other windows I can see all the keyframes. What?!