I am attempting to update, and when doing so, I get the following error. Can someone point me in the direction of where to look regarding this error. Not quite sure which plugin it's coming from to track down the issue?

"Declaration of Illuminate\View\Factory::composer($views, $callback) must be compatible with Illuminate\Contracts\View\Factory::composer($views, $callback, $priority = NULL)", "exception"

Check your plugins for ones that have vendor folders. It's happening because a plugin is attempting to pull in Laravel itself but the version it's using doesn't match up to the version of Laravel used by the October core.