/path/to/file/**/*.js matches any number of directories between /path/to/file/ and /*.js. As opposed to /path/to/file/*/*.js, which matches a single directory between /path/to/file/ and /*.js.
/path/to/file/**/*.js matches any number of directories between /path/to/file/ and /*.js. As opposed to /path/to/file/*/*.js, which matches a single directory between /path/to/file/ and /*.js.
The requested URL was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.