ive tried everything to fix this, including detaching the blueprint id, how do i fix this?
id is not allowed to be used, Make sure you’re using SDK 3.9.0 or newer.
It says it in the error right there. You’ll need to update to avatar SDK 3.9.0 or later in your project to upload new avatars, due to ID generation changes described in SDK 3.9.0 release notes: Release 3.9.0 | VRChat Creation
Open VRChat Creator Companion (or ALCOM if you use that), manage your avatar project, and update your dependencies (avatar SDK) to the latest version.
- VRChat on X: “We have finally pushed out an API change that will prevent anyone from uploading a new avatar if they are not using SDK3.9.0 or newer. Please update your SDK! While you will still be able to update old avatars, you will not be able to upload brand new ones - this is due to the” / X - December 12, 2025.
- Developer Update - 14 August 2025 - Official / Dev Updates - VRChat Ask Forum