How do I get rid of this error message: Deleting items in folder (xxx) failed due to the following error: Resource name “people/115119779208741860112” is not a valid contact person resource.
Suggest to go into your contacts online and search and delete that problematic contact. Then close and reopen eM Client and that should then fix it. Then recreate the contact.
If you then still get the error in eM Client, right click on your Contacts folder in eM Client and click “Properties” at the bottom and click “Repair” at the top. Then click the Repair Button and that will normally resync your online contacts back to eM Client if it’s got out of sync.
If still a problem and everything looks ok online with your contacts, then you might need to either export your contacts from online to a .vcf (vCard) or .csv (Comma separated value) file, and then delete your contacts in eM Client and then reimport them via “Menu / File / Import”.
Lastly if still getting the error and you have an IMAP, Exchange, Office 365 or iCloud (non POP) account, you might need to remove and readd your account via “Menu / Accounts”.