Gmail IMAP stopped working

Hi, I built Mailspring from source a couple of days ago, it worked fine with IMAP, it had been working for about 2 or 3 days, but now it stopped working, I haven’t changed anything.

It shows error:

The log shows:

----------IMAP----------
connect mailcore::IMAPSession:0x7ffd77e4fe30
ssl connect imap.gmail.com 993 43
connect error 43

The IMAP in gmail setting is enabled, and I can telnet imap.gmail.com 993, why the connect error?

I tried to build from the latest source, same problem.

OS: Fedora
Mailspring: built from source (commit 8a8ddf4b)

BTW, why it shows “The app is blocked” when login with OAuth?