old_contents: 
  class FileResolver(object):
  
      def read(self, path):
          with open(path, 'r') as file:
              return file.read()
  
new_contents: 
  class FileResolver(object):
  
      def read(self, path):
          try:
              with open(path, 'r') as f:
                  return f.read()
          except IOError as e:
              raise CfnSphereException("Cannot read file " + path, e) 
  
subject: Throw CfnSphereException on IOErrors. Fix landmark issue.