Irlharu0w0,
when you are in unity click on inspector thats the tab in the right corner,then click on your avatar name in the hierachy. next step is go back to the inspector tab and scroll down until you see something like vrchat blueprint or vrcblueprint,under this you should see large number like abc123_av45shjjahjhdh, under this there should be "detach" button click on that and on the place where the large number was must be gone and should be empty. now you can upload it, i hope i could help ^^

Irlharu0w0,
Did you remove the blueprint id?

does anyone know how to fix "error saving blueprint". I reimport sdks, and the package itself. I also close and reopen unity and i still have no fix :).

https://rinebean.gumroad.com/l/dRTMxf