Hi!
If you are not using the Core plugin, the RPG Maker MZ will tell you that on the Plugin Manager window.
But, your other error is my bad. You need another plugin for that to work: pixi-filters.js
I have added that into the Map Transition zip file on the plugin page. Sorry about that. Download the plugin again, then put the pixi-filters.js that will come on the downloaded zip on the top of your plugin manager.
Let me know if it worked!