Advanced Calendar App - Contact List

Hello,

Just wanted to get some feedback regarding changing "contact list" fields in the Advanced Calendar Application.

When i am editing "contact list" fields (such as a users name) directly in the advanced Calendar App, then press the "update" button so the information is updated in the related Smartsheets, i am getting an error message.

The error message says "unable to update event"

Has anyone else found this problem or know how to resolve?  

Thanks

Andrew