./import_logs.py fatal error processing Jetty request logs? (no replies)

Jetty claims to create "standard NCSA format" request logs. See http://eclipse.org/jetty/documentation/current/configuring-jetty-request-logs.html

But ./import_logs.py yields:

Fatal error: cannot automatically determine the log format using the first 100000 lines of the log file.
Maybe try specifying the format with the --log-format-name command line argument.

This format is not supported? Or if supported then what --log-format-name should be specified?

Thanks.

Lou.