I perform following tutorial for my knowledge
http://docs.mongodb.org/manual/tutorial/convert-replica-set-to-replicated-shard-cluster/

In this Tutorial i Start three mongod instances
then
mongo localhost:10001/admin
db.runCommand({"replSetInitiate" :
{"_id" : "firstset", "members" : [

{"_id" : 1, "host" : "localhost:10001"}

,

{"_id" : 2, "host" : "localhost:10002"}

,

{"_id" : 3, "host" : "localhost:10003"}

]}})

but above runCommand give me a following error

{ "errmsg" : "couldn't initiate : assertion db/pdfile.cpp:437", "ok" : 0 }

then i try rs.initiate()
but it also give same error
{
"info2" : "no configuration explicitly specified – making one",
"me" : "devindia-desktop:10001",
"errmsg" : "couldn't initiate : assertion db/pdfile.cpp:437",
"ok" : 0
}

how can i solve this error what i doing wrong in this Tutorial