odd ZipArchive error

Hello again: I am getting an odd ZipArchive::open error. I don't really understand this error, let alone why I am getting it. This is all I can find in the online manual. ZipArchive::ER_MULTIDISK (integer) Multi-disk zip archives not supported. all the files referenced are on the same disc at or below the "home dir", in this case '/<path>/dev_lab'; I am developing on a Mac OSX Yosemite/Apache/php v5.5x. The machine is a multi core intel processor, but what would that have to do with it? All the dev activity is in the Apache document root directory. This is what my code is trying to do, essentially; $_name = /<path>/dev_lab/dist/new.zip $_retStr = self::$_zipper->open($_name, ZIPARCHIVE::CREATE); So this was picked up in code because ZipArchive::close comes up false; But close is supposed to be called automatically, so why would it be necessary to call close explicitly in order to get the return value of open? My code tests for a return value of open before testing for the return value of close. It does not see a return value for open, but sees a false value for close and presents the error code returned by open. Thanks for time and attention JK