[Error] New Bag Screen

[#Not Important]

So, I made a 9th bag screen, and when I obtain the Item that is meant to go there, well...
It doesn't...
So here Is the script for the 9th bag screen:

#===============================================================================
# * The names of each pocket of the Bag. Leave the first entry blank.
# * The maximum number of slots per pocket (-1 means infinite number). Ignore
#      the first number (0).
# * The maximum number of items each slot in the Bag can hold.
# * Whether each pocket in turn auto-sorts itself by item ID number. Ignore the
#      first entry (the 0).
#===============================================================================
def pbPocketNames; return ["",
   _INTL("Items"),
   _INTL("Medicine"),
   _INTL("Poké Balls"),
   _INTL("TMs & HMs"),
   _INTL("Berries"),
   _INTL("Mail"),
   _INTL("Battle Items"),
   _INTL("Key Items"),
   _INTL("Zodiac Gems")
]; end
MAXPOCKETSIZE  = [0,-1,-1,-1,-1,-1,-1,-1,-1]
BAGMAXPERSLOT  = 999
POCKETAUTOSORT = [0,true,true,true,true,true,true,true,true,true]

And this is the error message that shows up in debug mode:

---------------------------
Pokemon Metal Might
---------------------------
[Pokémon Essentials version 17.2]

Exception: NoMethodError

Message: undefined method `length' for nil:NilClass

PItem_Bag:147:in `pbStoreItem'

Debug_Menu:390:in `pbDebugMenuActions'

Debug_Menu:382:in `pbListScreenBlock'

Editor_Listers:91:in `loop'

Editor_Listers:116:in `pbListScreenBlock'

Debug_Menu:382:in `pbDebugMenuActions'

Debug_Menu:744:in `pbDebugMenu'

Debug_Menu:710:in `loop'

Debug_Menu:746:in `pbDebugMenu'

ModularMenu:462



This exception was logged in 

C:\Users\RPG maker XP 2\Saved Games\Pokemon Metal Might\errorlog.txt.

Press Ctrl+C to copy this message to the clipboard.
---------------------------
OK   
---------------------------

 

[Vendily]

Did you start a new save? An old save would be set up with the old number of pockets.
also MAXPOCKETSIZE doesn't have enough entries, i think.

 

[Golisopod User]

This might not be helpful in this situation but I'd honestly ditch the Mail Pocket for the Zodiac Crystal one.

 

[Black Temple Gaurdian]

Well I mean, one very obvious issue is you have 9 pockets (not counting the blank one), and you've only defined a size for 8 of them...

 

[#Not Important]

Oh, right
But i ditched the mail pocket so...
Yeah