Change the mod icon but display just purple

We wanna to change the Icon of the mod which will be shown in the players room, and we follow the guides(https://support.ageofempires.com/hc/en-us/articles/4421721200532-Editing-a-Win-Condition) ,made a correct path and a correct image, set the “Selected image” to our image, but when i enter the game, the icon of the mod still show as only a strange purple, i checked for a long time but nothong found. I thougt it may be a bug or wrong description in the guides. Can anyone know how to deal with this?

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