What does this means?

Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release
Err:3 http://dl.google.com/linux/chrome/deb stable Release.gpg
The following signatures were invalid: EXPKEYSIG 1397BC53640DB551 Google Inc. (Linux Packages Signing Authority) [email protected]
Get:4 https://deb.parrotsec.org/parrot parrot InRelease [14.6 kB]
Fetched 14.6 kB in 3s (4,368 B/s)
Reading package lists… Done
Building dependency tree
Reading state information… Done
All packages are up to date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com/linux/chrome/deb stable Release: The following signatures were invalid: EXPKEYSIG 1397BC53640DB551 Google Inc. (Linux Packages Signing Authority) [email protected]
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg The following signatures were invalid: EXPKEYSIG 1397BC53640DB551 Google Inc. (Linux Packages Signing Authority) [email protected]
W: Some index files failed to download. They have been ignored, or old ones used instead.
┌─[[email protected]]─[~]
└──╼ #
My network connection is working properly and suddenly i got this when i checked for updates in Parrot OS 4.6. Can anyone explain me what is going on?