Hello @CassianoMendes-3745!
TFS is now Azure DevOps Server so you'll want to speak with DevOps specialists using the link below. My understanding is that error can mean a couple things from request timeouts (there may be a temporary issue with the service) or even full storage.
The Azure DevOps team and DevOps community are actively answering questions here:
https://developercommunity.visualstudio.com/spaces/21/index.html