Build Mode cannot read any project file — closeCanceled / An internal error occurred

Google AI Studio
,
1

Hello,

I am experiencing a reproducible failure in Google AI Studio Build Mode on an existing project.

The Build Agent starts normally and can list the project files, but it consistently fails whenever it attempts to read the contents of any file.

Error:

closeCanceled
An internal error occurred.

Steps to reproduce:

  1. Start a new Build Mode conversation.
  2. Prompt: “Olá” → SUCCESS.
  3. Prompt: “Liste os arquivos do projeto. Não altere nada.” → SUCCESS.
  4. Prompt: “Leia App.tsx. Não altere nada.” → FAIL.
  5. Prompt: “Leia apenas package.json. Não altere nada.” → FAIL.
  6. A diagnostic prompt and a request to prepare a support report also fail with the same error.

The failure occurs with extremely short, read-only prompts. No code modification is requested.

Project: Lolly Final

Applet ID:
081a2cfc-39b6-423a-a57*******

Model:
Gemini 3.7 Flash

Timestamp reported by the Build Agent:
2026-09-01T11:26:32-07:00

Impact:

The Build Agent is currently unable to read project files, which blocks normal development and maintenance of the project.

No project files have been intentionally modified during these diagnostic tests.

I have already submitted the same incident through the AI Studio “Submit Bug” feedback mechanism.

Could you please investigate whether the Build Agent or workspace/container for this specific Applet is stuck or corrupted?

I have previously experienced a similar situation in another AI development platform where creating a Remix of the project resolved the problem. Before doing that here, I would like to know whether Remix is a recommended recovery procedure for this issue, because I do not want to modify, reset, or delete the original project.

Thank you.

2

Hello @Marcus_Borky ,

Yes, please try remixing the app and see if you are able to make progress in the remixed app.

3

UPDATE — September 2, 2026

I performed an additional controlled test using a fresh Remix of the same project.

The Build Agent can respond normally when no workspace access is required:

Prompt:
“Do not change anything in this project.
Respond only with:
TEST OK”

Result:
TEST OK — Gemini 3.8 Flash — 1 second

However, the Build Agent fails immediately when asked to read a project file:

Prompt:
“Do not modify any files.
Read only package.json and tell me whether you were able to read it, the project name, and the project version.”

Result:
Gemini 3.8 Flash — Canceled
closeCanceled
error: An internal error occurred

The same workspace-access failure occurs in both:

  1. the original project
  2. a fresh Remix of the project

This suggests that the chat/model itself is working, but the Build Agent is failing when accessing the project workspace/files.

Original Applet ID:
081a2cfc-39b6-423a-a57b-2443a*****

No files were modified during these tests.

Could you please investigate the Build Agent/workspace access issue and confirm whether this is a known incident or an environment-side problem?