Radiant can’t load ActiveSupport caching?

Are you getting this error message when attempting to deploy your Radiant application?

no such file to load -- active_support/cache/memory_store

The fix is simple. Assuming you’re using a vendored copy of Radiant or Rails, you probably have an entry for “cache” in your .gitignore file or your svn:ignore property. Remove it, commit the changes, and deploy again. Bingo!

Don’t ask me how I know this.