This is a LaTeX question, but I was not able to find anything on TexExchange or generally by googling.
I am using avm.sty in a project, very much like usual, in Overleaf, with a bunch of other packages. Everything was fine until I came back to the paper recently, and I saw that it is now complaining about the avms:
It compiles and renders the PDF just fine, but the errors produce very annoying red highlighting all over the source which makes it very hard to work on the paper.
The AVMs did not change. I haven’t added new packages. Something probably has changed in one of the packages that Overleaf is pulling from somewhere. Before I start eliminating them one by one, has anyone seen this error before and knows where it comes from?
Here’s a copy of the project to look at.