Need help in installing galaxy on centos8.1

Hi, enveryone. I need your help.
My system is centOS8.1. I would like to install a local galaxy for bioinformatics analysis. I am following the instruction as below:
$git clone -b release_21.01 https://github.com/galaxyproject/galaxy.git
$cd galaxy
$sh run.sh
When I use “sh run.sh”, I enountered an error as the attached picture show:
[1/4] Resolving packages…
warning Resolution field “chokidar@3.4.0” is incompatible with requested version “chokidar@^2.0.0”
warning Resolution field “chokidar@3.4.0” is incompatible with requested version “chokidar@^2.1.8”
warning Resolution field “chokidar@3.4.0” is incompatible with requested version “chokidar@^2.0.4”
warning Resolution field “chokidar@3.4.0” is incompatible with requested version “chokidar@^2.1.8”
[2/4] Fetching packages…
error Command failed.
Exit code: 128
Command: git
Arguments: ls-remote --tags --heads https://github.com/sorich87/bootstrap-tour.git
Directory: /opt/biosoft/galaxy/client
Output:
fatal: unable to access ‘https://github.com/sorich87/bootstrap-tour.git/’: OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 104
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
ERROR: Galaxy client dependency installation failed. See ./client/README.md for more information, including how to get help.

I don’t know what’s wrong with it. I have tried google, but still could not solve the problem. Could someone help me? thank you.

I also install yarn manually,and the yarn version is 1.22.10
$yarn -v
1.22.10