"Cannot find module 'core-js/...'" error after upgrade to 1.4.2.7

help
1

Upgraded Meteor from 1.4.2.6 to 1.4.2.7 and now meteor will not run, throwing this error:

Error: Cannot find module 'core-js/library/fn/object/keys'
    at Function.Module._resolveFilename (module.js:325:15)
    at Function.Module._load (module.js:276:25)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (C:\Users\Paul\AppData\Local\.meteor\packages\meteor-tool\1.4.2_7\mt-os.windows.x86_32\dev_bun
dle\lib\node_modules\babel-runtime\core-js\object\keys.js:1:93)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)

Any thoughts on how to fix this? It appears to be a global problem as none of my meteor projects will now run on my development system.

2

OK, I appear to have fixed my problem. It looks like the /core-js/ files did not completely copy over. I copied the /core-js/ folder from 1.4.2_6 to 1.4.2_7 and problem solved.