That message usually appears when AI Studio can’t initialize the workspace due to a session or environment mismatch—often tied to expired credentials or a missing project context. The Studio web app depends on your active Google Cloud project and Vertex AI permissions. If your session token expires or if you recently changed the default project or region, the loader fails silently and shows the “Failed to load the app” banner.
Open AI Studio directly from the Vertex AI section in the Cloud Console, confirm the project selector is set to a valid project with Vertex AI API enabled, and refresh. If that doesn’t work, clear your browser cache or start a new incognito session to force a fresh authentication handshake. Users without roles/aistudio.user or roles/vertexviewer on the selected project also see this error, so verify those IAM bindings under IAM & Admin.
—Taz