'create' was used as prefix and suffix, change dupli list functions to use as suffix, this matches obj.animation_data_create() & obj.animation_data_clear(). obj.create_dupli_list() --> obj.dupli_list_create() obj.free_dupli_list() --> obj.dupli_list_clear() Don't use 'create' for object to mesh function since other uses of this are for createing data which stays attached, instead use mathutils style naming convention. obj.create_mesh() --> obj.to_mesh()