Metamask not allowing any transaction by code

I am building an application using ethereum smart contracts. I am using Metamask Chrome extension to run my application on Chrome. But I am facing a little issue. When I try to make any transaction by code Metamask say’s that the account balance of sender is insufficient despite of the fact that sender’s account has ethers in it. On the other hand when I try to make a transaction through my Metamask account there is not error and transactions are being made successfully.

Here is the screenshot of Metamask

Does anyone have an idea what could be the problem?

And here is the screenshot for the sender’s account having ether