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Help center14 answers, every error code

What is on your screen?

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Install
Install
Sign in
Start a browser
Start a browser
Start a browser
Start a browser
Start a browser
Plan limits
Plan limits
Connect an agent
Connect an agent
Connect an agent
Workflows

Install

Windows protected your PC

Expected: choose More info, then Run anyway.

The installer has no Windows certificate yet, so Windows asks before it runs it. The release itself is signed, and the app checks every update's signature before it installs it.

Every error code

An error comes back as { "code": 4012, "message": "…" }. 4007 is retired and 4009 does not exist.

CodeWhat it means
4001NOT_FOUND · 404In the Errors page of the docs
4002PROXY/GEO · 409In the Errors page of the docs
4003CAPACITY · 429This machine is full: its maximum, memory budget or free disk space. See the answer
4004ENGINE_MISSING · 503In the Errors page of the docs
4005PREFLIGHT · 409A start check failed, such as no real graphics card. See the answer
4006ALREADY_RUNNING · 409In the Errors page of the docs
4008CONCURRENCY_LIMIT · 409Your plan's browsers at once are all running. See the answer
4010UNAUTHORIZED · 401The bearer token is missing or wrong. See the answer
4011NOT_SIGNED_IN · 403No account is connected to this machine. See the answer
4012PROFILE_IN_USE · 409The profile runs on another machine of your account. See the answer
4013EXIT_ADDRESS_TAKEN · 409The exit address belongs to another profile. See the answer
4014PLAN_LIMIT · 409Your plan does not allow it. See the answer

The docs go deeper

What does a website see of your browser? Run the free browser check.

Ask your agent instead: every docs page has a Markdown twin, and one file lists them all.

Still stuck? Write to us.

Put the error code and the step you were on in your mail. That is where the answer starts.

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