I just upgraded to 5.6.0.2 and now have this message??

Warning: Concrete5_Library_Loader::require_once(/home/quality/public_html/concrete/updates/concrete5.6.0.2/concrete/models/json.php) [function.Concrete5-Library-Loader-require-once]: failed to open stream: No such file or directory in /home/quality/public_html/concrete/updates/concrete5.6.0.2/concrete/core/libraries/loader.php on line 40

Fatal error: Concrete5_Library_Loader::require_once() [function.require]: Failed opening required '/home/quality/public_html/concrete/updates/concrete5.6.0.2/concrete/models/json.php' (include_path='/home/quality/public_html/concrete/libraries/3rdparty:/home/quality/public_html/concrete/updates/concrete5.6.0.2/concrete/libraries/3rdparty:.:/usr/lib/php:/usr/local/lib/php') in /home/quality/public_html/concrete/updates/concrete5.6.0.2/concrete/core/libraries/loader.php on line 40

Any help greatly appreciated.