Does not match regex pattern?

I am working in perspective making flex containers in flex contrainers to make a page that looks like an excel page with color toggling

A bunch of the flex containers have this meta red triangle symbol saying

does not match the regex pattern followed by symbols numbers and letters
name is broken or something?
I don’t understand what is wrong


Component names are not supposed to start with numbers, only letters (containing numbers in the rest of the name is fine). Among other things, it makes referencing them from scripting somewhat annoying.

renaming these is going to be annoying too

wish I saw that triangle sooner

thanks for the help