When trying to export an FBX file this error message appears. I am pretty new to blender 2.8 and I have done this model following different tutorials on youtube. To solve the error I have tried to remove all the materials from the objects but it is still not working. I imported some files from other websites into the scene like lights and furniture, some were OBJ other FBX.
I really need help to resolve this issue.
Thank you very much in advance for your help.
I attach here my blender file as well.