While trying to configure fresh sharding:

xm@celestine-3:~$ /opt/mongodb/bin/mongo celestine-3
MongoDB shell version: 1.6.5
connecting to: celestine-3
> use admin
switched to db admin
> db.printShardingStatus()
— Sharding Status —
sharding version:

{ "_id" : 1, "version" : 3 }

shards:
{
"_id" : "testRS",
"host" : "testRS/celestine-1:27100,celestine-3:27100,celestine-2:27100"
}
databases:

{ "_id" : "admin", "partitioned" : false, "primary" : "config" }

> db.runCommand(

{ enablesharding : "test1" }

)
{
"assertion" : "wrong type for BSONElement () 0 != 8",
"assertionCode" : 13111,
"errmsg" : "db assertion failure",
"ok" : 0
}
> db.runCommand(

{ enablesharding : "test1" }

)

{ "ok" : 1 }