Mongos - Query error

After we configured six replica set servers and three config servers with mongos. we could not able to see records from mongos server. Kindly have a look my below errors and please suggest to us.

mongos>use test switched to db test mongos> show collections; 2014-12-03T15:11:09.312+0300 error: { "$err" : "could not initialize sharding on connection firstset/localhost1:10001,localhost2:10002,localhost3:10003 :: caused by :: mongos specified a different config database string : stored : X.X.X.1:20001 vs given : X.X.X.1:20001,X.X.X.2:20002,X.X.X.3:20003", "code" : 15907, "shard" : "firstset" } at src/mongo/shell/query.js:131 mongos>