Hello. Thank you for contacting the Toolset support.
I checked the debug information you shared but I could not able to spot what Types plugin version you are using.
Can you please share what kind of relationship you created? (one-to-one, one-to-many or many-to-many)
Where exactly you see the error you mentioning? Can you please share the problem URL and access details?
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.