When I have created a CityGML writer and add another one with the same specs except for the file name, running the process ends in an error.
Both writers are separate. So it's not one CityGML writer writing two Feature Types (that won't work).
Those are the warnings and the only error I get:
2020-08-10 10:38:15| 13.3| 0.0|WARN |Duplicate XML Schema attribute declaration found - QName: 'xml:lang', schema URL: 'file:///C:/Program Files/FME2020/xml/schemas/CityGML/CityGML/2.0/3.1.1/smil/xml-mod.xsd'
2020-08-10 10:38:15| 13.3| 0.0|WARN |Duplicate XML Schema attribute declaration found - QName: 'xml:space', schema URL: 'file:///C:/Program Files/FME2020/xml/schemas/CityGML/CityGML/2.0/3.1.1/smil/xml-mod.xsd'
2020-08-10 10:38:15| 13.3| 0.0|WARN |Duplicate XML Schema attribute group definition found - QName: 'xml:specialAttrs', schema URL: 'file:///C:/Program Files/FME2020/xml/schemas/CityGML/CityGML/2.0/3.1.1/smil/xml-mod.xsd'
2020-08-10 10:38:15| 14.1| 0.0|WARN |Duplicate XML Schema attribute declaration found - QName: 'xml:lang', schema URL: 'file:///C:/Program Files/FME2020/xml/schemas/CityGML/CityGML/2.0/3.1.1/smil/xml-mod.xsd'
2020-08-10 10:38:15| 14.1| 0.0|WARN |Duplicate XML Schema attribute declaration found - QName: 'xml:space', schema URL: 'file:///C:/Program Files/FME2020/xml/schemas/CityGML/CityGML/2.0/3.1.1/smil/xml-mod.xsd'
2020-08-10 10:38:15| 14.1| 0.0|WARN |Duplicate XML Schema attribute group definition found - QName: 'xml:specialAttrs', schema URL: 'file:///C:/Program Files/FME2020/xml/schemas/CityGML/CityGML/2.0/3.1.1/smil/xml-mod.xsd'
Error running translation.