*Salesforce/MailChimp Integration*

Hoping someone has an answer. Integration was set up between Sailsforce and MailChimp and syncing suddenly stopped. Contacts appear blank. Upon trying to set up integration, presented with this notice- 

"Read" permission to field "MC4SF__Sync_Setting__c" on object "MC4SF__MC_List__c" is not allowed for the current user.

Error is in expression '{!initPage}' in component <apex:page> in page mc4sf:setup: (MC4SF)

An unexpected error has occurred. Your solution provider has been notified. (MC4SF)

*Thank you!*