Problem with “Value cannot be null. Parameter name

Question

I have a problem with my site TFS when I click on my project on site:

Value cannot be null. Parameter name: key

I tried to find a solution to fix, but couldn't. I hope that anyone can help me.

Thank you very much and regards.

Answer 1

We had the same issue, turns out there is a problem with the latest version (2.0.3) of the vsts-team-calendar extension:

https://github.com/microsoft/vsts-team-calendar/issues/260

"As soon as this extension was pushed out, all the Team Projects disappeared from the web portal in the project collections with the extension. You will get an error on the page, "Value cannot be null. Parameter name: key". Other project collections without the extension work as expected. Disabling the extension will resolve the problem."

When removed, problem was solved.

Answer 2

Apologies for the issue. This has been fixed on latest version (2.0.9) of the vsts-team-calendar extension.

Response from ruturaj-h

version 2.0.8 includes the fix, please disable the extension, wait till update is downloaded from marketplace, enable the extension when you see current version to be 2.0.8.

You can check version and enable disable extension from extension management page by clicking on the extension.

To install "Team Calendar" on Azure DevOps Server/TFS, perform following steps:

• Navigate to the Azure DevOps Server Extensions page on your server. (For example, http://someserver/_gallery/manage)
• Click upload new extension and select the file you have just downloaded.
• After the extension has successfully uploaded, click Install and select the Team Project Collection to install into.