Hi...
I'm having issues with the Shield Block plugin. Whenever I try to test play my game, it gives me a message saying something about being unable to read a property 'length' of undefined. This happens whether I have all my plugins turned on or just Yanfly's Core, Battle Core, Buffs and States, and the Shield Block plugin. It does not happen if I turn Shield Block off.

If I have all my plugins on, it sends me on a wild goose chase listing them; this image was taken with just Block Chance and its prerequisites.
I can get a plugin list if required, although I have confirmed that it's Block Chance and it's not conflicting with any other plugins (or at least, something is happening with it regardless of whether it's conflicting with something else or not, so the conflict I can work out later). My Yanfly plugins are in the order shown on the wiki with one exception that I was advised to move to improve compatibility with another plugin; this is not the source of the conflict, as I was having trouble with Block Chance before installing the out-of-order plugin. I have Block Chance directly under Battle Core as is written in the instructions.
That said, my first question would be if there are any other required plugins besides Yanfly Core, Yanfly Battle Core, and Yanfly Buffs and States Core. It's possible that I forgot or misread something somewhere.