I received this error after running the ‘meteor’ command on Windows 7 without changing anything on my app previously.
After much searching, the solution to this problem was simply to change the cosmos:browserify@0.8.4 line on .meteor/versions to cosmos:browserify@0.8.3.
I leave this here to report about what seems to be a bug of the latest cosmos:browserify release but mainly to save time to another dev who might encounter this same issue.
