[HOOK - conan-center.py] pre_export(): WARN: [RECIPE METADATA (KB-H003)] Conanfile doesn't have 'topics' attribute. 
ERROR: box2d/2.3.1: Error in package() method, line 41
	self.copy("License.txt", dst="licenses", src=os.path.join(self._source_subfolder, "Box2D"))
	AttributeError: 'Box2dConan' object has no attribute '_source_subfolder'