Thanks for getting in touch and sorry to hear about the rough start. That error indicates that you likely are running PHP 5.2. TubePress requires 1 PHP 5.3.29 or higher. Thankfully, many web hosts allow you to easily switch PHP versions, so I would suggest that you contact your host to find out how to use a more modern version of PHP on your website.
> 2. Can tubepress automatically posts when a youtube channel upload a new video?
Yes. TubePress monitors your video sources and automatically reflects any changes to the underlying video feeds (see these docs for how to get started [2, 3]. You may also be interested in Auto Post 4, which can create a new post/page for each video in a gallery.
Thanks for choosing TubePress and please let us know if there is anything else we can do to assist!
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