Campaign Response errors are based on the role permissions in Salesforce in most cases.
To overcome this error, log in to your Salesforce account and change the permissions for the user in Salesforce which is using SyncApps by enabling the Salesforce "Marketing User" on the user's record.
Error creating Notes. insufficient access rights on cross-reference id
Error Code: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY
Please let us know if the error still persists and we will help you troubleshoot 24/7.