Critical Bug: Persistent HTTP 400 "Invalid project resource name projects/" even after Gmail switch

[shino]

I am experiencing the same issue. For more than a week, Google Antigravity has been completely unusable.

Trajectory ID: a0c3a57a-a78c-
Error: HTTP 400 Bad Request
Sherlog: 
TraceID: 0x8937
Headers: {"Alt-Svc":["h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000"],"Content-Length":["382"],"Content-Type":["text/event-stream"],"Date":["Fri, 20 Feb 2026 05:05:01 GMT"],"Server":["ESF"],"Server-Timing":["gfet4t7; dur=186"],"Vary":["Origin","X-Origin","Referer"],"X-Cloudaicompanion-Trace-Id":["8937f8afd59c6aa2"],"X-Content-Type-Options":["nosniff"],"X-Frame-Options":["SAMEORIGIN"],"X-Xss-Protection":["0"]}

{
  "error": {
    "code": 400,
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "description": "Invalid project resource name",
            "field": "name"
          }
        ]
      }
    ],
    "message": "Invalid project resource name projects/",
    "status": "INVALID_ARGUMENT"
  }
}