[SOLVED]Unit flag texture error

[DeepSoul]

Downloded a civ from steam workshop and added some custom art for the leader, but used the same unit flags as the civ had by default. Imported all the textures in asset editor with user interface as class for the unit flags, and everything looks good. However, in the game the unit flags only show correctly on the civ selection screen, while in the diplomacy screen and on the unit itself they're showing this image error. What's wrong? I've managed the make a mod successfully with the very same textures before and they are all in the same dds format.