Build Error in 2021.4.2 community edition

when I open an existed project, the UiPath would show an error.
The error message are as follows:


The feed ‘ []’ lists package ‘UiPath.UIAutomation.Activities.20.10.9’ but multiple attempts to download the nupkg have failed. The feed is either invalid or required packages were removed while the current operation was in progress. Verify the package exists on the feed and try again.
“dependencies”: {
“UiPath.Excel.Activities”: “[2.9.5]”,
“UiPath.Mail.Activities”: “[1.9.5]”,
“UiPath.Python.Activities”: “[1.1.7594.35963]”,
“UiPath.System.Activities”: “[20.10.3]”,
“UiPath.UIAutomation.Activities”: “[20.10.9]”,
“UiPath.WebAPI.Activities”: “[1.4.5]”

I also repaired in studio,and also changed the version of packages.
It didn’t work.
what’s the matter?

Hi @jmy,
Do you have still this issue? I tested it and mentioned version is downloading without any issue on my end. Sometimes might have a bad day. Please check again.

I think it might be a bug. in Version2021.4.2 and 4.3.
After I install 2021.4.3,I even can’t create a new procject.Because of can’t import the four basic packages.
by the way,I’m in China.

Hi @jiangmy,
Welcome to the Community!
Any chances that your VPN or firewall is blocking you?

Chinese special firewall.

This might be an issue here. All packages are being downloaded as NuGet packages from If this is blocked by anything it will make issues as you have.