code: def buffers_exist(self):
          
          for buff in self.buffers:
              if not buff.is_separate_file:
                  continue
  
              path = self.path.parent / buff.uri
              if not os.path.exists(path):
                  raise FileNotFoundError("Buffer {} referenced in {} not found".format(path, self.path))
docs: Checks if the bin files referenced exist