ERROR MESSAGE SINCE THE LATEST MV UPDATE?

Hello everyone. It's Chief here and I've ran into a serious problem with the latest MV update. Just recently, Yanfly had posted a video regarding about some plugins that needed to be updated for MV 1.6.0. I followed his instructions to update the plugins and I got this error message upon testing:



I've never seen this error message before. The main game I've been working on is the only project that has this message (and it was working just fine the other day!). And because of this, I can't playtest my game. =( I've updated both the Item Core and Core Engine but nothing's working. I'm also not using the Grid Free Doodad so that eliminates one problem. If anyone has experienced this lately and found a solution, I can really use your help on this one! It's probably something minor but I'm not sure what to do at this point.

UPDATE!

To avoid double posting, I'll just say it here. I just found the solution today and I can playtest again! Hooray! If anyone is getting this error message, here's what I did.

-I made a brand new project. You don't need to do anything with it.
-Go into the new project's folder, navigate to the 'js' folder and copy the 'libs' folder and paste and replace it in your existing project.
-Then copy the index.html from the new project and replace it in your existing project.

If done right, this should clear the bug.