Cannot upload files in CityGML format

I uploaded a file in CityGML format to Cesium and got an error with the attached image.

Is there any way to upload a file in CityGML format to Cesium without modification?

Hi - At this time Relief Components are not supported by the CityGML pipeline. We recommend that you convert your Terrain into GeoTIFF and upload it as terrain data.

me too how can i fix this error issue

Hi - Looks like there is either a validation issue with the CityGML file you have uploaded, or that it has unsupported tags. The tiling pipelines do not support tags such as ReliefFetaures in CityGML, as those are better handled as terrain features.

Can you please run a validator on your CityGML file as well?