You'll need to post a screenshot of all of your plug-ins in order for us to help you. I have Yanfly's Menu engine, 0 errors, so chances are it is a issue in either how it is set up, or a conflict between it and another plug-in you have. But, to be sure, we'll need a screenshot of all of your plug-ins that are installed.

I think the issue is gameus's quest editor plugin... it work now, but I removed the quest log from the menu manager. You have any experience on making it work with game's plugin?Your plug-ins are out of order. According to Yanfly's website, the menu engine should be near the top of the plug-in lists. I show it should be above where you have message core.
Also, while probably not related, Save Core is out of order too. You may wish to go here and see in what order the plug-ins have to be in to work properly.
Link: http://yanfly.moe/yep/
