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running "gulp" not working after installing babel 6

See original GitHub issue

I pulled the latest este, ran npm install and then gulp. Running the gulp default task results in:

$ gulp
[11:25:20] Requiring external module babel/register
/Users/rkoberg/Sites/este/node_modules/babel/node_modules/babel-core/lib/transformation/file/options/option-manager.js:126
      if (!option) this.log.error("Unknown option: " + alias + "." + key, ReferenceError);
                           ^

TypeError: Cannot read property 'error' of undefined
    at OptionManager.mergeOptions (/Users/rkoberg/Sites/este/node_modules/babel/node_modules/babel-core/lib/transformation/file/options/option-manager.js:126:28)
    at OptionManager.addConfig (/Users/rkoberg/Sites/este/node_modules/babel/node_modules/babel-core/lib/transformation/file/options/option-manager.js:107:10)
    at OptionManager.findConfigs (/Users/rkoberg/Sites/este/node_modules/babel/node_modules/babel-core/lib/transformation/file/options/option-manager.js:168:35)
    at OptionManager.init (/Users/rkoberg/Sites/este/node_modules/babel/node_modules/babel-core/lib/transformation/file/options/option-manager.js:229:12)
    at compile (/Users/rkoberg/Sites/este/node_modules/babel/node_modules/babel-core/lib/api/register/node.js:117:22)
    at normalLoader (/Users/rkoberg/Sites/este/node_modules/babel/node_modules/babel-core/lib/api/register/node.js:199:14)
    at Object.require.extensions.(anonymous function) [as .js] (/Users/rkoberg/Sites/este/node_modules/babel/node_modules/babel-core/lib/api/register/node.js:216:7)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Module.require (module.js:366:17)

googling for “babel-core/lib/transformation/file/options/option-manager.js:126 TypeError: Cannot read property ‘error’ of undefined” brings up a page of similar complaints about switching to babel 6. The most common problem seems to be that a cached version of babel is being used. The only thing I have global is npm. I cleared my user’s npm cache and ran the npm install again, but still get the error above. Any ideas how to fix?