Gatsu can you share the content of your composer.json
? It seems s9e/text-formatter
might have end up inside of it, but it shouldn't.
If s9e/text-formatter
is inside of the file, you should remove that line, then run composer update s9e/text-formatter
, this should fix the problem.
It's not related to the extension you are trying to install. It's a problem with the current state of your installation.