I am using Unity version 2021.3.14f1, when I import poly brushes from package manage, there is a bug like this, is there a way to fix it
That package seems to be incompatible with your editor version, at least regarding this particular method.
The docs list this method as being added in 2021.3 so my hunch is that it was a late addition to 2021.3 and simply not yet available in 2021.3.14. I remember I ran into this myself. Since you’re missing out on 20+ patch releases generally, try with 2021.3.38f1.
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That’s bad, my project is coding on the system 2021.3.14f1, I don’t know if there will be unity support for this bug in the future?
But not that specific .14 version. These are bugfix releases, they don’t introduce breaking changes (inadvertent ones are rather rare, like this new method which was assumed to be in all 2021.3 but wasn’t actually added until later). If there’s a bug or incompatibility at the patch level your only option is to upgrade to a later patch level.
Thank you very much, maybe I’ll start my project over again with a newer version of Unity
You don’t need to start over. You just make a backup of the project (just in case), then open the project with the newer editor version 2021.3.38, confirm the update message, wait, and then test to see if everything still runs okay.