Unable to deploy to Netlify

[Dan Collins]

I've been trying to deploy my Hexo blog on Netlify to no avail. 

GITHUB REPO:

https://github.com/clarkwire/blog 

NETLIFY DEPLOY ERROR:

Production: master@HEADFAILED
failed during stage 'preparing repo': Error checking out submodules: fatal: No url found for submodule path 'themes/hexo-theme-hiero' in .gitmodules

 Error checking out submodules: fatal: No url found for submodule path 'themes/hexo-theme-hiero' in .gitmodules

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