My organization would like to perform actions in Salesforce that are not included in the base functionality, so we would like to install Apps. Obviously we use well reviewed (4+ stars, many reviews, etc) apps only, and in the comments I cannot find people discussing these errors, so I suppose it must be on our end.
However, when I install the apps on our sandbox, I always get the following error when I try to use them to change contact information:
MC4SF.Contact: execution of AfterUpdate caused by: System.DmlException: Update failed. First exception on row 1 with id a1036000004nATOAA2; first error: INVALID_CROSS_REFERENCE_KEY, invalid cross reference id:  (MC4SF)
Is this caused by something I can fix in settings?
(The most recent app that we tried and had this issue with is Mass Transfer Contacts).
Thanks very much