API error type

Profile already in use

HTTP 409 · https://errors.driftstack.dev/profile-in-use

What it means

A session-create carried a profile_id that already has a live (non-terminal) session. A profile can run only one session at a time — two sessions on the same profile would both restore and then overwrite the same saved cookies and logins, losing your data. The body carries active_session_id, the live session you already have running. Sessions without a profile_id are never affected.

How to fix it

End the session named in active_session_id (or wait for it to finish), then launch again. If you need parallel runs, use separate profiles.

Where it appears

In the type field of the RFC 9457 application/problem+json error body, alongside title, status, detail, and an instance correlation id.

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