I want to convert a file (.las) to format (citygml), but when performing the task in the software (FME QUICK TRASLATOR), it generates an error. the file in (.las), is a file made with drone

Can you post the error?

Agree with @hkingsbury​ that providing the error or full log would help.

I'm thinking that translating a point cloud to CityGML will require some transformations and the Quick Translator may not the best option. Consider creating a workspace using FME Workbench. Here are some resources that may help you get started:

• Point Cloud to 3D Terrain Model with Buildings
• 3D Transformations