Unable to delete contacts in People

Hello,

Trying to delete contacts from People. Checked the checkboxes on my contacts whom I want to delete from People.

Also tried to delete one by one at a time.

Then, for former way, the dust box icon is grey out.

For latter way, dust box appears, however, some particular contacts show the error message and says "Issues and cannot delete." The screeshot of the error message is as follows. 

It appeared at the event when I deleted the contact in my People.

It says that "problem happened. Due to the problem, unable to delete." Cancel in blue highlighted

Please advise how to delete contacts in People.

　https://people.live.com/