assertion Failed error while running Bitcoin-Qt application?

I have downloaded Bitcoin-qt project from Github for Ubuntu 14.04, But I dont know why iI am getting error Error: /main.cpp:2985: bool InitBlockIndex(): Assertion `block.hashMerkleRoot == uint256("0x7c0b21983dc5a17daeef4b6b936375b0a59f3414af7a1bf248d98209447a494b")' failed. The program has unexpectedly finished.

I have already Look into the debug.log file and put the GenesisBlock, but still I am getting same error again and again. Please help me on this to resolve. I am using Bitcoin-QT Project.