Most of my kits have been working fine when I used them, but I have recently made two kits that are not working properly. Whenever I do /kit [kitname], I get the kit but I get the error ingame that says: 'An internal error occurred while attempting to perform this command'. I listed the text below, the kits that are not working properly are Witch and Blaze. Sorry if I'm missing something obvious, I'm new to this plugin. Thanks for your help and time!

kits:
archer:
active-in: '''PvP'''
items:
helmet: gold
chestplate: diamond
leggings: diamond
boots: diamond
'0': 350:64
'1': '0'
'2': '0'
'3': '0'
'4': 261 48:3
'5': '0'
'6': '0'
'7': '0'
'8': '332:16'
'9': '0'
'10': '0'
'11': '0'
'12': '0'
'13': '0'
'14': '0'
'15': '0'
'16': 262:64
'17': 262:64
'18': '0'
'19': '0'
'20': '0'
'21': '0'
'22': '0'
'23': '0'
'24': '0'
'25': '0'
'26': '0'
'27': '0'
'28': '0'
'29': '0'
'30': '0'
'31': '0'
'32': '0'
'33': '0'
'34': '0'
'35': '0'
pvp:
active-in: '''PvP'''
items:
helmet: diamond
chestplate: iron
leggings: iron
boots: diamond
'0': 350:64
'1': '0'
'2': '0'
'3': '0'
'4': 276 16:1
'5': '0'
'6': '0'
'7': '0'
'8': '332:16'
'9': '0'
'10': '0'
'11': '0'
'12': '0'
'13': '0'
'14': '0'
'15': '0'
'16': '0'
'17': '0'
'18': '0'
'19': '0'
'20': '0'
'21': '0'
'22': '0'
'23': '0'
'24': '0'
'25': '0'
'26': '0'
'27': '0'
'28': '0'
'29': '0'
'30': '0'
'31': '0'
'32': '0'
'33': '0'
'34': '0'
'35': '0'
russia:
active-in: '''PvP'''
items:
helmet: gold
chestplate: iron
leggings: gold
boots: gold
'0': '350:64'
'1': '0'
'2': '0'
'3': 272 19:2
'4': 272 16:5
'5': 272 20:1
'6': '0'
'7': '0'
'8': '332:16'
'9': '0'
'10': '0'
'11': '0'
'12': '0'
'13': '0'
'14': '0'
'15': '0'
'16': '0'
'17': '0'
'18': '0'
'19': '0'
'20': '0'
'21': '0'
'22': '0'
'23': '0'
'24': '0'
'25': '0'
'26': '0'
'27': '0'
'28': '0'
'29': '0'
'30': '0'
'31': '0'
'32': '0'
'33': '0'
'34': '0'
'35': '0'
Blaze:
active-in: '''PvP'''
items:
helmet:
chestplate: gold
leggings:
boots:
chestplateEnchant: 1:3
'0': '350:64'
'1': '0'
'2': '0'
'3': 261 50:1 48:1
'4': '0'
'5': 283 20:2 34:3 16:1
'6': '0'
'7': '0'
'8': '332:16'
'9': '0'
'10': '0'
'11': '0'
'12': '0'
'13': '0'
'14': '0'
'15': '0'
'16': '262:64'
'17': '262:64'
'18': '0'
'19': '0'
'20': '0'
'21': '0'
'22': '0'
'23': '0'
'24': '0'
'25': '0'
'26': '0'
'27': '0'
'28': '0'
'29': '0'
'30': '0'
'31': '0'
'32': '0'
'33': '0'
'34': '0'
'35': '0'
Witch:
active-in: '''PvP'''
items:
helmet: iron
chestplate: gold
leggins: gold
boots: iron
chestplateEnchant: 1:3
'0': '373:1:16147'
'1': '0'
'2': '373:1:16386'
'3': '0'
'4': 268 16:3
'5': '0'
'6': '373:1:16426'
'7': '0'
'8': '373:1:16460'
'9': '0'
'10': '0'
'11': '0'
'12': '0'
'13': '0'
'14': '0'
'15': '0'
'16': 262:64
'17': 262:64
'18': '0'
'19': '0'
'20': '0'
'21': '0'
'22': '0'
'23': '0'
'24': '0'
'25': '0'
'26': '0'
'27': '0'
'28': '0'
'29': '0'
'30': '0'
'31': '0'
'32': '0'
'33': '0'
'34': '0'
'35': '0'

Internal errors are normally caused by YAML issues. It would be easier to help if you put the kits.yml into http://yaml-online-parser.appspot.com/ clicked on "Link to this page", and then gave the url

'0': 350:64 needs quotes around it because it uses the ':' character. Should look like '0': '350:64'. This will be the case for a lot of lines in the file. https://github.com/np98765/BattleKits/blob/master/src/main/resources/kits.yml has a working config you can use.