Kernel.org server couldn't fulfill request.
Error code: 404
This is because the files that were hosted on kernel.org that contained the relevant Kernel and Patch information parsed by KernelCheck have been removed. We don't know why kernel.org have removed these files, all we know is that they no longer exist.
At the moment, we (Master_Kernel and my self) are too busy with other commitments (work, study, etc) to investigate and fix the problem at this time. So KernelCheck development is on hold until further notice.
However, if someone wants step in and help fix the problem, they are more than welcome. We can be contacted via the KernelCheck launchpad page.
How do I build a new kernel without KernelCheck?
There is an excellent guide for building new kernels manually here: Master Kernel Thread.