When does the error occur?
The error occurs when you are associating your TestComplete project's test case with a team project’s test cases managed with Azure DevOps or Team Foundation Server and click the ellipsis button in the Associate with Azure DevOps / TFS Test Cases wizard.
Why is the message shown?
The message is shown because TestComplete failed to get any test cases from the team project to which your TestComplete project is connected. This can happen because the connection to the team project is lost or because the specified team project does not have any test items.
Workarounds
Make sure that your TestComplete project is connected to your Azure DevOps team project and can access it properly.
Make sure that the specified team project has any test cases.