JP Choices Script brings an error, how can I make it work?

[Theguysayshi]

Apologies in advance for anything stupid, this is my first post on the forums.
So, I have this great script made by a Japanese Creator that adds more options to choices, specifically:

- More than four choices
- Menu positioning
- Display info for choices etc...

But most importantly, it is able to set the default choice option. This is important for a game idea I have.
Unfortunatly, when I run the game with the script, I get the error:
"Script 'Choice_EX' Line 324: NoMethodError occurred
undefined method 'empty?' for nil:NilClass"
which is
"update_help if active && !$game_message.choice_help.empty?" for me.

Could someone please tell me a fix for this to get it working (it works fine on the game I discovered it on) and what I can do to get it to work please? I suspect that it might be a conflicting script that I have on the game I want it on, but I have no idea what one, and I have no idea what I need to do to have both working at the same time.

Any help is appreciated.
You can find the Script (and description of what it does) here: http://woodpenguin.web.fc2.com/rgss3/choice_ex.html (I used Google Translate to understand the details)
And before you ask yes, I didn't translate the script itself before using it ><;

 

[Kes]

[move]RGSSx Script Support[/move]

 

[TheoAllen]

Let me make a wild guess. Are u using existing save game?

 

[Theguysayshi]

Let me make a wild guess. Are u using existing save game?

...oh my goodness, that was exactly it! Thanks a bunch!
Man, I feel really stupid now.

I guess the question then becomes, how can I update my saves so they work with this new script? Is it possible? What do I need to do?

 

[Andar]

You can't.
If you add a script or a plugin that changed the savegame structure, then you have to start a new game.

Which is why we usually suggest to decide on plugins and scripts first, before going too far into development and playtests.

 

[Theguysayshi]

Oh... that's a huge problem considering what I'm working on. That really sucks...

I guess I'm better off searching for a different script that "sets the default choice option", that doesn't destroy saves. I believe it's in RPGMakerMV but not in VXAce.
I guess I'll create another post in the necessary forum with that question in mind. Thank you to you all, you've been very helpful!

 

[TheoAllen]

Most of time, you can't.

HOWEVER, the reason you can't is usually because of how the scripter designed the code. And it's already been common practice. With a little patch, it should works.

Here, try to put this on new slot below the script

class Game_Message
  def choice_row_max; @choice_row_max ||= WdTk::ChoiceEX::RowMax; end
  def choice_help; @choice_help ||= {}; end
  def choice_var_id; @choice_var_id ||= 0; end
  def choice_background; @choice_background ||= 0; end
end

 

[Andar]

Sorry, Bad news:
80% of all plugins (MV) and scripts (Ace) will destroy savefiles.
For a lot of functions that is required for the script to work.

Why is that such a Problem? You'll have to start new games for playtests dozens of times before you can finish your game anyway.

 

[Theguysayshi]

Oh great googly moogly! You're the best TheoAllen! Thank you so much ^^

The saves are back and usable! With that in mind, script should work as intended now.
Thank you so so much! You may have saved me from a world of frustration haha

I'm going to test out the script functions in a bit. So far they seem to work just fine.

 

[Theguysayshi]

Turns out the script conflicts with Galv's Visual Novel Choices script. Oh well.

I’m going to post another topic requesting a script that allows me to change the default choice option (changed through a variable). Would someone be willing to point me to the right forum, or is it ok to ask for scripts here?
Edit: Don’t worry. I found it.

Thanks in advance for everyone the helped/posted in the topic. I really appreciate it.