FearLess Cheat Engine

If i change something is the Z.js file, i get disconnected from the game and can't log back in. When i log in with my google account, it says log in successful then nothing happens.

I have been trying to change the eggshell cost to upgrade a nest. I've been looking around this: "NEST_UPGRADE_EGGSHELL",t=b.engine.gameAttributes,null!=e.aa3?t.setReserved("aa3",80):t.h.aa3=80,t=b.engine,n=null==(n=b.engine.getGameAttribute("TankLVs")[3*Math.ceil(b.engine.getGameAttribute("aa2")-1)...