[Error Downloading File?]

So, I've hit a minor problem with my modpack...  Every time one attempts to install it, the following error occurs:

And every time I try to edit the "settings" page, it gives me the following:

Oddly enough, when I go back to the settings, it appears my amendments have been saved though.  Does anyone know what seems to be the issue?

Here's my info if needed:

Modpack Page: http://technicpack.net/modpack/pixelmon-doubleplusgood-alpha.623912

API Link: http://api.technicpack.net/modpack/pixelmon-doubleplusgood-alpha

Direct Link: https://copy.com/cZq8pl6ppSCkEa3M/pixelmon-doubleplusgood-1.0.zip?download=1