POPup pro is being used to build subscribers but returns an error message

Michelle Shull asked me to grant her access so to the wpmudev dashport - I did - but never heard back as to what happend to the problem resolution. I would like to resolve the problem please. see this link
https://premium.wpmudev.org/forums/topic/popup-gives-an-error-after-clicking-on-signup#post-762779
I had the pops up disabled. I have granted support access. There are two popups. One with only email and one with email and first name. They both give error message. Thank you for your help

I have another question and that Is: is it possible to add email subscribers to the membership file? As of now i have to add the manually.