Zotero could find a record for specified identifier

Zotero was working fine but suddenly in the middle of the day I tried using the "add items by identifier" function and after a few seconds I got an error message saying:
"Look up failed: Zotero could not find a record for the specified identifier. Please verify the identifier and try again." I rechecked the doi and it was accurate. This happened for 3 consecutive article searches.
This discussion has been closed.