notes app error notification

Hi, I randomly picked up my phone and saw this notification on my lock screen from the notes app.

Create Note 26m ago

The request was denied by service delegate (SBMainWorkspace) for reason:

Locked ("Unable to launch com.apple.mobilenotes because the device was not, or could not be, unlocked").

The request to open

"com.apple.mobilenotes" failed.

what does this mean?? was someone trying to hack my notes app remotely?? this freaked me out and I also asked reddit and no one seems to know over there.