Sorry , the message was send too quickly ! that the message i got when i open a yaml file :

■  Error (use-package): emacs/:config: End of file during parsing: Error reading from stdin             
■  Warning (treesit): Cannot activate tree-sitter, because language grammar for yaml is unavailable (no\
t-found): (libtree-sitter-yaml libtree-sitter-yaml.0 libtree-sitter-yaml.0.0 libtree-sitter-yaml.so libt\
ree-sitter-yaml.so.0 libtree-sitter-yaml.so.0.0) No such file or directory                               
■  Warning (treesit): Cannot activate tree-sitter, because language grammar for yaml is unavailable (no\
t-found): (libtree-sitter-yaml libtree-sitter-yaml.0 libtree-sitter-yaml.0.0 libtree-sitter-yaml.so libt\
ree-sitter-yaml.so.0 libtree-sitter-yaml.so.0.0) No such file or directory

Have you run M-x treesit-install-language-grammar?

There's a comment at the top of the dev.el extra file to run this. TBH the situation with built-in treesitter isn't the best.

Hi, yea , but it won't works. I didn't understand i must install the source. Now it works, thank you.

You can close this ticket