After a 2.0.0-rc.17 fresh install and import from V1, when changing the git schedule from 5 minutes to 0 minutes and 5 hours, I can see a red pop up with "Unexpected error" for few seconds then I have a green pop up with "Storage configuration saved successfully."

I encountered the same problem.
Debian GNU/Linux 10 (buster)
(PostgreSQL) 11.5 (Debian 11.5-1+deb10u1)
node v10.16.2
git version 2.20.1
And cannot modify the default interval 5 minutes. After changing github schedule interval to eg. 15 minutes, it will pop up with "Unexpected error", then shortly pop up "Storage configuration saved successfully."
Then click save again, now the setting is 15 minutes, but after refreshing the page, the setting will be back to the default 5 minutes.
PS: Git sync works ok.
Same exact problem here:
Same exact problem too
Most helpful comment
I encountered the same problem.
Debian GNU/Linux 10 (buster)
(PostgreSQL) 11.5 (Debian 11.5-1+deb10u1)
node v10.16.2
git version 2.20.1
And cannot modify the default interval 5 minutes. After changing github schedule interval to eg. 15 minutes, it will pop up with "Unexpected error", then shortly pop up "Storage configuration saved successfully."
Then click save again, now the setting is 15 minutes, but after refreshing the page, the setting will be back to the default 5 minutes.
PS: Git sync works ok.