That's not really that many items. If you go to Tools → Developer → Run JavaScript and run the following line, what's the result?

[JavaScript Error: "Transaction timeout, most likely caused by unresolved pending work." {file: "resource://gre/modules/Sqlite.jsm" line: 1036}]

[JavaScript Error: "Translator called selectItems with no items

If you go to Tools → Developer → Run JavaScript and run this code, what's the result?

[JavaScript Error: "TypeError: controller is undefined" {file: "chrome://zotero/content/bindings/itembox.xml" line: 1642}]

[JavaScript Error: "Error: Only 0 translators present in cache. Resetting

[JavaScript Error: "The connection was refused when attempting to contact wss://stream.zotero.org/." {file: "chrome://zotero/content/xpcom/streamer.js" line: 155}]

[JavaScript Error: "Translator called selectItems with no items

The right-click on the selected text will also be useful to add more copy options from plugins. [JavaScript Error: "event.target.classList is undefined" {file: "resource://zotero/reader/reader.js" lin

that I inserted to put text inside it tells me "[JavaScript Error: "Zotero fields cannot be inserted here."]". I would like to know how to resolve the problem. Thanks in advance.

The next click deletes all the previous drawing, and starts again as above. [JavaScript Error: "position.rects is undefined" {file: "resource://zotero/reader/reader.js" line: 23692}]

[JavaScript Error: "Win error 32 during operation move on file C:\Users\[…]\Documents\Dropbox\zotero\tmp\chicago-note-bibliography.csl (Le processus ne peut pas accéder au fichier car ce fichier est u

[JavaScript Error: "Upload request 1/2286FGFK failed"]

[JavaScript Error: "HTTP request to https://kns.cnki.net/dm/api/ShowExport has timed out after 15000ms" {file: "chrome-extension://nmhdhpibnnopknkmonacoephklnflpho/zotero.js" line: 306}]

Could you suggest what should I fix? I don't have any experience with javascript. I am just using the translator created by others. Thank you.

[JavaScript Error: "Invalid or missing translator metadata JSON object in zotero-translator-tana-cf.js" {file: "chrome://zotero/content/xpcom/translation/translators.js" line: 325}]

[JavaScript Error: "Error: HTTP request to https://kns-cnki-net.s.libvpn.XXXX.edu.cn:20080/dm/api/ShowExport rejected with status 0

--> At this stage, the Annotations pane crashes and disappears, together with the top bar at the top of the PDF Viewer containing the Toolbar. I cannot make any annotation anymore in that tab. I also

At your own risk: * Go into Tools -> Developer -> Run Javascript

syncing churns for a minute before saying "[JavaScript Error: "Error connecting to server. Check your Internet connection."]".