Gatsby builds local, but fails on Netlify

hey @yosuke -

this is the source of the problem:

6:36:26 AM: error "gatsby-node.js" threw an error while running the createPages lifecycle:
6:36:26 AM: Reducers may not dispatch actions.
6:36:26 AM: 
6:36:26 AM: 
6:36:26 AM:   Error: Reducers may not dispatch actions.

Now why this is occurring is a different question - if it runs locally, it may be a version mismatch between the packages that are being used locally vs. on netlify, or it may be a case issue.

Here is some good general debugging information that might be helpful:

This Support Guide contains a ton of useful debugging tips.