If you get this error while uploading a new theme, your web server is rejecting the upload due to the overall size of the file. WordPress is unfortunately giving you a rather ambiguous message in response. This is not a theme issue or bug.
In order to increase your PHP limits do the following:
Find where your
php.ini file is:
Make sure the following are set:
post_max_size = 80M upload_max_filesize = 80M
Restart web server:
$ service httpd restart