[SCRIPTING] [RGSS] [RMXP] BATTLE SYSTEM ERROR

Hello everyone, it's been a while.

To get to the point, I've got 3 battle scripts going on currently, and that's all I plan mostly. It feels like alot of scripts are not compatible with http://rpgmaker.net/scripts/29/ or http://forums.rpgmakerweb.com/index.php?/topic/37195-charge-turn-battle-ctb-system-final-fantasy-x-tactics-style/ and they are not compatible with each other. I am also using http://rpgmaker.net/scripts/347/ though it is mostly an appearance change for the battle system when you beat the opponent.

It is a NoMethodError

author=The Error Message
Script 'Chrono Cross Color Field' line 213: NoMethodError occured
undefined method 'refresh' for nil:NilClass

When it goes back to the editor and I check the script, I saw this line:

author=Chrono Cross Color Field Line 213
@color_icons.refresh(@color_set)

I know that NoMethodError means that the script is trying to access a method/class that does not exist, but I don't understand what it is referring to or how to fix it. Can anyone give me some insight to the problem? Is it incompatibility? Could someone fix the scripts to be compatible if that's the issue? If not, I'll gladly take out the problematic script(I have tried the Color Field script on its own and while no error popped up, it didn't work properly as in no symbols appeared like there was suppose to)