Error when query data

Today my website occurs error and I detected due to mongo DB. I see this message error : "localhost:27017: assertion src/mongo/db/exec/and_hash.cpp:275"

My mongo Db version is 2.6.3

If anybody see the same error and resolved, please tell me me how to fix it.

This is my site : http://www.maritech.com.vn/liveais_new/

What do you see in mongod logs?

Regardless of that, I would recommend upgrading to the latest 2.6.x (which is currently 2.6.6) - it's possible this is a known bug that was fixed.

Without seeing more about the error (from mongod logs) it's hard to say for sure.