[Scripting Question] Error starting battles, Double or Single

So, I've spent the past 5 days updating my game from Essentials Version 14 to Essentials Version 16.2, and I've just finished- or I would be, if I didn't run into an error report that I can't figure out how to fix.

Yes, there is custom stuff, it's a modified version of Essentials V16.2. I'm not sure what else I can say, so if there's anything I'm forgetting to mention, just ask and I'll try my best to answer. I hope to get this resolved as quickly as possible

Man, you'll agree with me that it is impossible to determine a solution to a problem of which we know nothing.
First, we don't know if you updated the engine from 14 to 16.2 properly;
Second, we don't know if your changes affect the basic engine that, in itself, functioning properly;

I was kinda hoping that the error report would give some inkling of where I did went wrong during updating. I updated from V14 to V15 first, and that worked fine. But the changes between V15 and V16 had me completely blustered during the entire process; there were just so many changes to the way things were handled between the two versions, that I spent basically an entire day just trying figuring out what to do. I've had update exhaustion before, but from v15 to v16 was terrible.
I'm really not sure what else I can do to show off the problem, short of like, uploading both my copy of V15 and V16.

Edit:
Ooooooh my sweets, I think I found what I did wrong now that i'm more functionally awake.
I accidentally pasted the entirety of PokeBattle_Battler in the PokeBattle_Scene section.
I'm not sure how that happened, but I've been so tired this past week of updating that I must have did it and flat out not noticed.

Is it working properly now?

It's working as it should now, yeah. This is what I get for working on updating for an entire day with little-to-no breaks, I guess!