Fantastic60's Built-in Function option is disabled and got matching key Pause error

[anjari]

I want to program my KBP V60 Type R keyboard and when I entered the default KBP V60 keymap into the tkg.io with Keyboard = "Fantastic60" and Layer Mode = "Simple":

[{a:2},"Esc\n\n\n\n~\n`",{a:4},"!\n1\n\n\nF1","@\n2\n\n\nF2","#\n3\n\n\nF3","$\n4\n\n\nF4","%\n5\n\n\nF5","^\n6\n\n\nF6","&\n7\n\n\nF7","*\n8\n\n\nF8","(\n9\n\n\nF9",")\n0\n\n\nF10","_\n-\n\n\nF11","+\n=\n\n\nF12",{w:2},"Backspace\n\n\n\nDelete"],
[{w:1.5},"Tab","Q","W\n\n\n\nUp","E\n\n\n\nFn4","R\n\n\n\nFn5","T\n\n\n\nFn7","Y\n\n\n\nFn9","U","I\n\n\n\nPrtsc","O\n\n\n\nScrlk","P\n\n\n\nPause","{\n[\n\n\nUp","}\n]",{w:1.5},"|\n\\\n\n\nInsert"],
[{w:1.75},"Caps Lock","A\n\n\n\nLeft","S\n\n\n\nDown","D\n\n\n\nRight","F\n\n\n\nFn6","G\n\n\n\nFn8","H\n\n\n\nFn10","J","K\n\n\n\nHome","L\n\n\n\nPgup",":\n;\n\n\nLeft","\"\n'\n\n\nRight",{w:2.25},"Enter"],
[{w:2.25},"LShift","Z\n\n\n\nFn2","X\n\n\n\nFn1","C\n\n\n\nFn3","V","B\n\n\n\nVoldn","N\n\n\n\nVolup","M\n\n\n\nMute","<\n,\n\n\nEnd",">\n.\n\n\nPgdn","?\n/\n\n\nDown",{w:2.75},"RShift"],
[{w:1.25},"LCtrl",{w:1.25},"LWin",{w:1.25},"LAlt",{w:6.25},"Space",{w:1.25},"Fn0",{w:1.25},"RWin",{w:1.25},"Menu",{w:1.25},"RCtrl"]

I got two problems:

1. The option "Others" -> "Built-in function" for Fn key is grayed/disabled. I need this option to map the RGB increase/decrease function.

2. The Composite Layer textfield reports error "No matching key: Pause".

FYI I followed this tutorial. The video tutorial doesn't mention this issue, I wonder if there is new update on the website that caused this error.

Update:
I just found out kai.tkg.io and tkg.io are different website, I got no problem on the kai.tkg.io, so the problem is on tkg.io (without prefix kai).