We are sorry for the delay in response. I tried replicating what you said and when I tried to export the object with the same name an error box popped saying that the file with this name already existed and if I want to replace it and I select yes and then it did it fine.
The Error box that you shared is in a different language that I am not able to read. Could you please translate the error in English and share it with us? Please also share the version of XD you are using.