WordPress：致命错误，插件激活后未引发任何其他信息

Question

I'm building a plugin at the moment. In the "index"-page (the one with the information about the plugin) I use require_once . When I want to activate the plugin, a fatal error is thrown:
Plugin could not be activated because it triggered a fatal error.
No more information is shown.

I commented all the lines except require_once plugins_url('php/hooks.php', __FILE__); out and checked the path. Still triggering a fatal error. The problem has to be the require_once command but I don't know what to do about it. I have used this command in the exact same context, file and version of WordPress before and it worked back then.

Answer 1

Problem solved. require_once needs a path, not an URL.