Huffman coding algorithm question?

I found a source code of somebody creating a Huffman Coding algorithm. After I read the code, I didn't see any problem. So I downloaded it, and tried to run it. But then, it doesn't run (compiling fine). Probably there is something I misunderstood about the instruction of author. Can you guys please help me pointing out the problem here? Here is the link to source code.

The Laws of Cryptography: Huffman Coding Algorithm

Thank you very much!

"it doesn't run" is far too vague for us; ask the author of that article about your problems.

kind regards,

Jos