I have a multi site in WordPress. I want to use the wpml plugin for the root site. The problem I encounter is that when I add a new language to the website, it does not recognize the second language version and displays the 404 error page. Sometimes a second-language version is redirected to the main language site .. Thank you for guided me.
Sometimes setting your permalinks up and saving them helps solve this kind of problem. Settings-Permalinks-choose your default permalink structure and hit the Save.