The following errors have occurred since the Zotero Connector was started:

[JavaScript Error: "HTTP request to https://doi.org/10.3969/j.issn.1006-7086.2019.05.006 has timed out after 15000ms" {file: "chrome-extension://nmhdhpibnnopknkmonacoephklnflpho/zotero.js" line: 306}]

[JavaScript Error: "No items returned from any translator" {file: "chrome-extension://nmhdhpibnnopknkmonacoephklnflpho/zotero.js" line: 306}]

what's the meaning? How do I solve this problem?
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