An error, defined in grip/exceptions.py, that is raised when the specified Readme could not be found.
It is a subclass of NotFoundError.
An example usage can be found in readers.py in the readme_for method of the DirectoryReader class:
def readme_for(self, subpath):
...
# Check for existence
if not os.path.exists(filename):
raise ReadmeNotFoundError(filename)
...