If that doesn't answer your question, please provide URLs, say what browser and website or database you are using. The debug number alone provides a lot of information but the tech experts can better help you if you answer the questions on the page linked above.
@zhengyingnan: That's a bit complicated, but the site you're trying to save from isn't a supported site, so Zotero is just detecting DOIs on the page. But the site doesn't actually provide DOIs — there are just some DOIs that are embedded in the links, and there's no way for Zotero to reliably extract the DOI in all cases, which is causing an error. We should be able to fix this so there's at least no error and invalid DOIs are just skipped, but saving isn't going to work reliably.
(I'm not going to post the URL from your debug output, but you can share it if you want to.)
Your best bet for now is just to click through to the publisher site, which Zotero should generally support, if there's something you want to save.
Upgrade Storage
https://www.zotero.org/support/troubleshooting_translator_issues
If that doesn't answer your question, please provide URLs, say what browser and website or database you are using. The debug number alone provides a lot of information but the tech experts can better help you if you answer the questions on the page linked above.
(I'm not going to post the URL from your debug output, but you can share it if you want to.)
Your best bet for now is just to click through to the publisher site, which Zotero should generally support, if there's something you want to save.