Import not working – Invalid Data

I removed the date… but still won’t import. I have the PRO version on the old site and I want to import the slides to the new site (then I will transfer the license over to the new site). I get an Invalid Date message – even after I remove the date. The old site has to remain running whilst I transfer to a new VPS server… it is running signage TVs slides for 7 five star hotels. Is this any good… never used Gist before.

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The page I need help with: [log in to see the link]