Mac OS Installation Stuck.

I could not install mac os online.

So I am installing it by USB, and it is being stuck after just starting. As I see in the "Installer Log" I find following.

MacBook-Pro OSInstaller[478]: Client 0x7f94b7f12b40: phaseName = "OS Installer"

What does this mean? If it is an error, so How can cop up it.

Please Help me