Error while syncing to the cloud

Error message:
Last error: Error: GET info.json: Unknown error 2 (503): Update in process.

When I opened Joplin, it was syncing automatically, then I clicked "cancel" and then it said "canceling". Then I started typing..And checked for updates... Then I saw this error message... Did I do something wrong?

Joplin: Joplin 1.2.6 (prod, darwin)
OS: macOS Catalina Ver.10.15.7 (19H2)