alh

Try this thread:
http://ww.wp.xz.cn/support/topic/313122

Thanks for this solution. I want to add that this problem easily happens when zipping up the folder that a theme’s files are in, rather than individually selecting all the files to be zipped.

Basically, anytime a theme’s index page (not “wp-content/themes/index.php”, but rather “wp-content/themes/’THEMENAME’/index.php”) reside inside multiple folders, you will get this error.

Thanks again!