[SOLVED]District's Icon disappear or transfer to "?" while ingame.

[ImNoobSoWhat]

Hello, I have a problem with my mod's icon. It's district's icon which disappear in diplomatic player screen and random Icons in production queue, with map pin is "?". But in the start game (choose leader and custom game), the district icon appear normally. Other Icons like unit icons (copied from game) and leader's art work fine.
I help check and search google but still can not find the post so I started post this question in here.
Thank you for take a look.

 

[ImNoobSoWhat]

I know how to fix. All Icons should be put in one XLP file which is Atlas.xlp or Icons.xlp not Leader.xlp or Icons1,Icons2,Icons3.xlp.