sstableloader "Could not retrieve endpoint ranges"

[Mitch Gitman]

I'm using sstableloader to bulk-load a table from one cluster to another. I
can't just copy sstables because the clusters have different topologies.
While we're looking to upgrade soon to Cassandra 2.0.x, we're on Cassandra
1.2.19. The source data comes from a "nodetool snapshot."

Here's the command I ran:
sstableloader -d *IP_ADDRESSES_OF_SEED_NOTES* */SNAPSHOT_DIRECTORY/*

Here's the result I got:
Could not retrieve endpoint ranges:
 -pr,--principal                       kerberos principal
 -k,--keytab                           keytab location
 --ssl-keystore                        ssl keystore location
 --ssl-keystore-password               ssl keystore password
 --ssl-keystore-type                   ssl keystore type
 --ssl-truststore                      ssl truststore location
 --ssl-truststore-password             ssl truststore password
 --ssl-truststore-type                 ssl truststore type

Not sure what to make of this, what with the hints at security arguments
that pop up. The source and destination clusters have no security.

Hoping this might ring a bell with someone out there.