Hello @PeterA869 ,
Did you delete the contacts in another list while on a separate tab, then try deleting the same contacts in another tab? Is this happening with a single, particular contact, or is it occurring with multiple contacts when you try to delete them? Does the error occur after refreshing your page, or logging out and back in?
Support Tips
"There's a multitude of ways to engage your audience through us using your social platforms - via ads, social post metrics, email links, and more! " - Will
See ArticleSupport Tips
"Target your most engaged contacts by creating a segment. Create a special offer or show your appreciation!" - Caitlin
See ArticleSupport Tips
"Greet new contacts with one or more automated Welcome Emails depending on their interests or your business goals." - Nick
See Article