If you're running the Jasminum plugin, disable Jasminum, restart Zotero, and then reset translators from the Advanced → Files and Folders section of the Zotero settings.
If not, we'd want to see a Debug ID for reproducing this. (We never want raw error output here, just ids.)
It's likely a problem with your internet connection. The metadata lookup request to doi.org is timing out after 30 seconds. I'm afraid that's all we can tell you.
Upgrade Storage
If not, we'd want to see a Debug ID for reproducing this. (We never want raw error output here, just ids.)
Thank you so much.But I didnt see any plugins in my plugin manager,thank you for your help