fatal error while moving site with Snapshot "Fatal error:

Was moving and changing URL of a website. Destination website is: TheArtofHousekeeping.com. I'm getting a fatal error:
Fatal error: Class 'Upfront_PostPart_View' not found in /home1/grntiger/public_html/theartofhousekeeping.com/wp-content/themes/upfront/elements/upfront-post-data/lib/class_upfront_post_data_part_view.php on line 8

now, I can't log in or anything.

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when I compare Files, it looks like at the NEW destination, there is a folder called "upfront-post-data" that doesn't exist in the OLD destination. Can (should) I delete this folder?