Require Membership Block not supported

Replies: 0

With WordPress 5.8 and PMPro 2.6.1, Require Membership Block can not be seen in Gutenberg blocks. Either in existing posts, I get an error message(sorry for not in English).

https://prnt.sc/1qhz4nw

I have changed the theme, disabled other plugins, but the result was the same.

Have you seen this problem?

Thanks,