Unable to load Roto scripts

Upon starting Rotonda, an error similar to the one below is printed:

Unable to load Roto scripts:
read directory error for path /Users/jasper/Projects/rotonda/etc/filters:
No such file or directory (os error 2).
Roto filters 'rib-in-post-filter', 'bmp-in-filter', 'bgp-in-filter',
'rib-in-pre-filter' are referenced by your configuration but do not exist
because no .roto scripts could be loaded from the configured
`roto_scripts_path` directory '/etc/rotondafilters'. These filters will be ignored.

This is likely to happen when running rotonda by hand from a shell (as opposed to running it as a service after installing it from a package), without specifying a configuration file (with the -c option). In that case Rotonda falls back to the built-in configuration. This configuration expects to find specific filters in the absolute path /etc/rotonda/.

To obtain the required configuration files, refer to Downloading the configuration files.