adding items by PMID return error

Here is the PMID: 31482287

https://www.ncbi.nlm.nih.gov/pubmed/31482287

when I input 31482287 into the field of "Add Item(s) by Identifier", I got the following message:

Zotero could not find a record for the specified identifier. Please verify the identifier and try again.

The debug output is submitted with Debug ID D1535623511

Thanks a lot.

Best,
Jinsong
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