Error in adding citygml data

I tried uploading an asset which is in .gml format and there was an error message that shows up. 1

I looked up to the Supported data formats and saw that CityGML (.citygml, .xml, .gml) files are okay.

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

Welcome to the Cesium Community!

Can you provide us with the asset id of the CityGML asset you are trying to upload?

ID: 405962

This is the ID I saw under the Information tab.