error message [-app-name} - Document Preferences
                    Hi, I am using Zotero in Microsoft word and recently it has started throwing error messages every time I want to add a new citation. Apparently I am not using a valid style. The odd thing is that I always use Chicago and normally set my documents to this style setting at the beginning. But now I cannot even access the document preferences anymore as it always throws the same error message. I already completely uninstalled Zotero from my Mac and did a software update before reinstalling Zotero. It worked for one morning but now I have the same problem again. I assume it is a Zotero and not a Microsoft word problem as I also get an error message when I try to copy a citation via the function "create bibliography from item". 
Do you have any idea what I could do to solve this issue? Thank you!
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                            Do you have any idea what I could do to solve this issue? Thank you!
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After that, try resetting styles from the Advanced → Files and Folders section of the Zotero settings.
Does it work in a new, empty document?
export.lastStyle, what's the value?extensions.zotero.export.lastStyle. "export.lastStyle" is just a search term, and it will offer to create that as a new entry below theextensions.zotero.export.lastStyleline. But we want to know the value ofextensions.zotero.export.lastStyle.Sorry for for the confusion.
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extensions.zotero.export.lastStyletohttp://www.zotero.org/styles/apa, and then restart Zotero?extensions.zotero.export.lastLocaleextensions.zotero.export.quickCopy.localeextensions.zotero.export.quickCopy.settingThank you so much! All the error messages are gone.
Thank you again for all your help! I really appreciate it and am very glad that I can continue using Zotero.
Have a great day!