That looks like most likely a transient error, did you try it again? If not, can you verify that your Galaxy server is able to connect to the toolshed from the command line e.g. with curl https://toolshed.g2.bx.psu.edu/?
Hi @nate, thank you for support.
I solved it by upgrade mercurial (hg) to v5.5 in .venv
sound like hg <v5.5 does not supports or works with python3.
Thanks again
Hi, @Mushal_Allam!
Could you share how do you upgrade mercurial (hg) to v5.5 in Galaxy 20.05?
I got the same error in my docker Galaxy Server.
Thank you!