Error in adding citygml data building

Hi every one ,
I tried uploading an asset which is in .gml format and there was an error message that shows up.

I will appreciate any advice or instruction to fix this issue. Thanks!

Hi Fatima, have you tried uploading any other .gml files? It’s possible there is something wrong with this one (or it might be something on our end).

Hi Eli ,
in fact this citygml file was the output of a FME workflow converting an ifc file to cityGML ,it works on fme data inspector but i do not understand why not on cesium ion .
also , i tried to upload some other cityGML data (from internet ) but they didn’t work too .
I appreciate your help .