OK I am new here as of yesterday (Nov 10th 2022) but I figured out how to make the invalid post go away… (For me, on my Mac at least)…
I was going to delete Bricks and go with another builder and I remembered it is in Appearance / Themes rather than plugins so I went to delete it but I could not figure out how so I enabled the child theme that I had installed, and everything works now… The builder loads…
I hope this helps you guys too…